| cya | See ya | 100 |
| CYE | Check your email | 250 |
| CC | Carbon copy | 200 |
| CTN | Can't talk now | 200 |
| Cab | Taxi | 100 |
| Chicken | Scared | 125 |
| CDC | Centers for Disease Control and Prevention | 233 |
| CPR | Cardiopulmonary resuscitation | 100 |
| Crud | Junk | 100 |
| Cyberbully | A person who bullies someone using technology | 100 |
| COB | Close of business | 325 |
| CU | See you | 150 |
| CUL | See you later | 367 |
| c | See | 150 |
| CM | Call me | 300 |
| CTC | Call the cell | 200 |
| CYF | Check your Facebook | 200 |
| cz | Because | 133 |
| comp | Computer | 200 |
| cell | Cell phone | 200 |
| Cheesy | Lame humor | 400 |
| char | Character | 150 |
| combo | Combination | 150 |
| CMS | Content Management System | 200 |
| CCR | Creedence Clearwater Revival | 200 |
| Cheerio | Goodbye | 200 |
| Cheers | Regards | 250 |
| Creeper | A socially invasive person | 117 |
| CG | Computer Graphics | 300 |
| CTM | Chuckle to myself | 300 |
| CSS | Cascading Style Sheet | 133 |
| CEO | Chief executive officer | 200 |
| CT | Central time zone | 200 |
| CST | Central Standard Time | 200 |
| CD | Compact disc | 129 |
| CTE | Chronic traumatic encephalopathy | 200 |
| Cinderella | Underdog sports team | 150 |
| Cleanup | Player batting fourth in the lineup | 150 |
| Crying Jordan | A meme featuring a crying Michael Jordan | 133 |
| Celine a scene | To add a Celine Dion song to a video for maximum emotional impact | 125 |
| Cupcaking | Flirting | 200 |
| Crushing | Obsessed | 200 |
| Cyberbullying | Bullying a person using technology | 200 |
| Cold | Mean | 200 |
| CMIIW | Correct me if I'm wrong | 233 |
| cul8r | See you later | 400 |
| CUS | See you soon | 300 |
| CYL | Catch ya later | 300 |
| CFV | Call for votes | 300 |
| CYOA | Cover your own a** | 250 |
| chingo | Chat lingo | 250 |
| COC | Code of conduct | 275 |
| CID | Consider it done | 400 |
| cuz | Because | 225 |
| CU@ | See you around | 300 |
| CUB | Call you back | 350 |
| CME | Checking my e-mail | 275 |
| C&G | Chuckle and grin | 300 |
| CMB | Call me back | 300 |
| CTRN | Can't talk right now | 300 |
| CAC | Cool as a cucumber | 300 |
| C2C | Cam to cam | 300 |
| C4N | Ciao for now | 300 |
| CS | ChatSlang.com | 300 |
| COD | Call of Duty | 250 |
| COA | Course of action | 300 |
| CSL | Can't stop laughing | 300 |
| CYO | See you online | 300 |
| CYT | See you tomorrow | 300 |
| cata | Cataclysm | 300 |
| crit | Critical Strike | 300 |
| CICYHW | Can I copy your homework | 300 |
| CCG | Collectible card game | 300 |
| Chill | Relax | 160 |
| cmon | Come on | 267 |
| Crib | House | 300 |
| Chillax | Chill and relax | 200 |
| CSB | Cool story, bro | 250 |
| CX | Correction | 267 |
| Carry | MOBA player role | 200 |
| CC | Credit card | 300 |
| Cray | Crazy | 220 |
| Chrismukkah | Christmas and Hanukkah | 375 |
| Cheers | Congratulations | 300 |
| Creeper | Hostile mob | 275 |
| Crew | Group of friends | 250 |
| Crimbo | Christmas | 250 |
| Chivette | Female who likes theCHIVE | 250 |
| Chiver | Male who likes theCHIVE | 300 |
| Cow | Minecraft mob | 300 |
| Cracker | A white person | 400 |
| Cracka | A white person | 300 |
| CF | Cluster f*** | 250 |
| CRD | Caucasian Rhythm Disorder | 275 |
| Catch some rays | To go out in the sun | 250 |
| Cowboy Up | Get tough | 233 |
| CMU | Crack me up | 300 |
| CTC | Care to chat? | 250 |
| Catfish | To assume a false identity | 250 |
| Craydar | Ability to detect craziness | 250 |
| Crunk | Crazy and drunk | 300 |
| Crapple | Apple | 300 |
| Cougar | An older woman who dates younger men | 150 |
| CRPG | Computer role-playing game | 300 |
| C | Catcher | 300 |
| Cycle | Single, double, triple, and home run | 300 |
| Clutch | Ability to perform under pressure | 140 |
| CF | Center field | 300 |
| CCU | Critical care unit | 300 |
| CAD | Canadian dollar | 250 |
| CHF | Swiss franc | 350 |
| Card advantage | Possessing more cards than another player | 300 |
| COO | Chief operating officer | 300 |
| CPA | Certified Public Accountant | 300 |
| CHF | Congestive heart failure | 233 |
| COPD | Chronic obstructive pulmonary disease | 300 |
| CD | Certificate of deposit | 300 |
| Cutting down the nets | Won a basketball tournament | 250 |
| Chin music | Pitch that nearly hits the batter's head | 250 |
| Closer | A relief pitcher that finishes a baseball game | 250 |
| Cellar dweller | A team constantly in last place | 225 |
| Cheese | Good fastball | 350 |
| Cellar | Last place | 300 |
| Crows before hoes | Guy friends are more important than romantic interests | 233 |
| Circus catch | Acrobatic catch | 250 |
| Charity stripe | Free throw line | 250 |
| CGL | Complete game losses | 300 |
| Cellfish | Inconsiderate of others while talking on the phone | 225 |
| Cutter | Cut fastball | 300 |
| Cosplay | Costume play | 300 |
| Cosplayer | A person who wears a costume and plays a character | 300 |
| Cheddar | Good fastball | 300 |
| Crossed | High and drunk | 250 |
| Chipping | Attacking a blocking opponent | 233 |
| Casual | Game that requires little skill | 350 |
| Crash your squad | Join your group of friends | 233 |
| Camper | A player who doesn't move | 200 |
| CIO | Cry it out | 300 |
| Conversational remorse | Regret for not saying something in a conversation | 250 |
| Chip damage | Damage inflicted on a blocking opponent | 350 |
| Chunk | A golf shot that makes a divot | 300 |
| Cup | Hole | 300 |
| CSOM | Client side object model | 300 |
| Calexit | California exit from the United States | 250 |
| Ceiling | Upside of a player | 250 |
| Champion | League of Legends player-controlled character | 250 |
| Carries | MOBA players that carry their team | 300 |
| Cash me outside | Come outside and I'll beat you | 250 |
| Cuffing season | The fall and winter time period where people begin relationships | 300 |
| Catch and release | To flirt with someone then stop when the person wants commitment | 300 |
| Covfefe | Coverage | 200 |
| Creep | A basic unit | 300 |
| Crash | To quickly fall asleep | 300 |
| Cypher | An informal rap or dance gathering | 300 |
| Christmas bogus | Receiving nothing from your employer during Christmas | 300 |
| Christmas noob | A player playing a video game he received on Christmas for the first time | 300 |
| Clapback | A clever comeback | 233 |
| CONUS | Contiguous United States | 267 |
| Cruft | Redundant software or hardware | 300 |
| Cyberstalking | Stalking a person using technology | 300 |
| Copypasta | A block of text that is often copied and pasted online | 300 |
| COPPA | Children's Online Privacy Protection Act | 300 |
| COC | Clash of Clans | 300 |
| CG | Close game | 300 |
| Corona bump | Elbow bump with a person to avoid spreading the coronavirus | 300 |
| CUL | Call you later | 400 |
| CRS | Can't remember stuff | 400 |
| ctr | Center | 350 |
| cyr | Call your | 400 |
| COS | Child over shoulder | 400 |
| cul8rm8 | See you later m8 | 400 |
| CYB | Call you back | 250 |
| cul8r | Call you later | 400 |
| CTO | Check this out | 400 |
| COL | Crying out loud | 400 |
| CP | Club Penguin | 400 |
| CPE | Coolest Person Ever | 400 |
| CBF | Can't be bothered | 250 |
| CD9 | Parents are watching | 360 |
| CD99 | Parents are no longer watching | 400 |
| CYFB | Check your Facebook | 400 |
| CTHU | Cracking the heck up | 300 |
| CRTLA | Can't remember the three letter acronym | 400 |
| cu2mr | See you tomorrow | 450 |
| CNP | Continued next post | 400 |
| CYDI | Can ya dig it | 400 |
| CC | Crowd control | 400 |
| CRBT | Crying real big tears | 400 |
| CUOL | See you online | 400 |
| CAD | Control-alt-delete | 400 |
| CU2 | See you too | 400 |
| c/p | Crossposting | 400 |
| CIL | Check in later | 350 |
| C9 | Parent in room | 325 |
| C/S | Change subject | 400 |
| c-p | Sleepy | 350 |
| CIP | Customer initiated payment | 400 |
| Camping | Holding position | 400 |
| CTF | Capture the flag | 350 |
| CQC | Close quarters combat | 450 |
| CS | Caesarean section | 400 |
| Cheese | Cheap strategy | 325 |
| convo | Conversation | 400 |
| coo | Cool | 400 |
| CGM | Continuous Glucose Monitoring | 400 |
| CGMS | Continuous Glucose Monitoring System | 400 |
| cia | See ya | 450 |
| cd | Cooldown | 250 |
| ceebs | Can't be bothered | 400 |
| cud | Could | 400 |
| C/O | Care of | 400 |
| CS | Creep score | 400 |
| Chibi | Miniature Character | 400 |
| Circle button | Spin move | 267 |
| Chu | You | 450 |
| Chirp | Diss | 400 |
| Cushty | Cool | 400 |
| CTM | Complete the Monument | 225 |
| Clowning | Joking | 400 |
| CMP | Creative Multiplayer | 250 |
| Chicken | Minecraft mob | 350 |
| CRT | Cathode Ray Tube | 400 |
| chk | Check | 400 |
| cld | Could | 400 |
| clk | Click | 400 |
| cre8 | Create | 400 |
| churrin | Children | 350 |
| CF | Coffee freak | 400 |
| chln | Chilling | 467 |
| CLM | Career limiting move | 400 |
| cn | Can | 400 |
| COT | Circle of trust | 400 |
| CRAT | Can't remember a thing | 400 |
| CTFD | Calm the f*** down | 400 |
| CTMQ | Chuckling to myself quietly | 429 |
| CUIMD | See you in my dreams | 400 |
| CY | Calm yourself | 400 |
| CYM | Check your mail | 400 |
| CYM | Check your messages | 250 |
| CLAB | Crying like a baby | 400 |
| CCL | Couldn't care less | 400 |
| Cabbage | Paper money | 400 |
| Cook | To make methamphetamine | 400 |
| Chugger | An overbearing fundraiser | 267 |
| Chugging | Raising money for charity in a rude manner | 350 |
| Clickbait | Web content created to attract visitors | 350 |
| CG | Complete games | 400 |
| Coffice | Coffee shop office | 300 |
| CE | Chief executive | 400 |
| CFP | College Football Playoff | 350 |
| CAD | Coronary artery disease | 350 |
| CFO | Chief financial officer | 350 |
| CPC | Cost per click | 400 |
| cid | Acid | 400 |
| Coining | Using The Coin card in Hearthstone | 400 |
| Control deck | Card deck focused on controlling the game | 400 |
| celeb | Celebrity | 400 |
| CNA | Certified nursing assistant | 400 |
| CDT | Continuing day treatment | 400 |
| CRNA | Certified registered nurse anesthetist | 400 |
| CVA | Cerebrovascular accident | 400 |
| CICU | Cardiac intensive care unit | 300 |
| COI | Certificate of insurance | 400 |
| Can of corn | An easy catch by a fielder | 325 |
| Cellar dweller | Person who lives in the basement | 400 |
| Costcop | Costco worker who verifies your receipt | 400 |
| Carcolepsy | A condition of falling asleep once the car moves | 333 |
| Chopped | Drunk and high | 350 |
| Chairdrobe | Chair with clothes piled on it | 400 |
| Cinderfella | A guy who must be home by midnight | 400 |
| Crossfaded | Drunk and high | 350 |
| Clan | A video game team | 400 |
| Crunchy | Health-focused lifestyle | 350 |
| Crisp | Cool | 400 |
| Controller | Champion who supports allies | 400 |
| Caking | Flirting | 400 |
| Cuffing | Linking up with someone in a relationship | 350 |
| Cheat sheet | A list of players ranked in order of fantasy value | 400 |
| Cram | To study a lot right before an exam | 400 |
| Cipher | An informal dance or rap gathering | 400 |
| Cyberslacking | Using an employer's Internet for personal activities while working | 233 |
| Crooked H | Hillary Clinton | 350 |
| Christmas creep | The slow expansion of the Christmas shopping season | 350 |
| Clap back | A clever comeback | 350 |
| Cupcake | A young female who seeks favor with powerful men | 350 |
| Cap | Lie | 400 |
| Capping | Lying | 400 |
| Cybermob | A group of online users that harasses other users | 400 |
| Code 9 | Parents are here | 400 |
| Crybully | A person who bullies people while playing the victim | 400 |
| Cold | Awesome | 400 |
| CYA | Cover your a** | 400 |
| CG | Coconut gun | 400 |
| crz | Crazy | 500 |
| CUL | Catch you later | 500 |
| CULA | See you later alligator | 300 |
| CWOT | Complete waste of time | 500 |
| CYWW2BY | See ya, wouldn't want to be ya | 500 |
| CC | I understand | 500 |
| CIS | Consumer Information Service | 500 |
| CRAFT | Can't remember a freakin' thing | 500 |
| CAS | Clothing Acquisition Syndrome | 400 |
| CBA | Can't be ar**d | 300 |
| CIP | Cell it please | 500 |
| CICU | Can I see you? | 500 |
| chx | Chickens | 500 |
| CB | Chris Brown | 500 |
| CMFWIC | Chief mo fo of who's in charge | 500 |
| CYM | Check your MySpace | 375 |
| CNRHKYITF | Chuck Norris roundhouse kick you in the face | 480 |
| CTFU | Cracking the f*** up | 367 |
| CRB | Come right back | 500 |
| CDIWY | Couldn't do it without you | 500 |
| CFS | Care for a secret? | 500 |
| CSG | Chuckle snicker grin | 500 |
| CTS | Change the subject | 500 |
| CWYL | Chat with you later | 300 |
| cyal8r | See you later | 300 |
| Choob | Skilled player who intentionally plays badly | 225 |
| chargelot | Charge Zealot | 300 |
| CC | Command Center | 367 |
| cdr | Cooldown reduction | 500 |
| CRN | Chuckling right now | 500 |
| CU46 | See you for sex | 267 |
| CICYH | Can I copy your homework | 450 |
| cqrt | Security | 300 |
| CRAWS | Can't remember anything worth a sh** | 500 |
| CSABR | Continued success and best regards | 500 |
| CS | Caught stealing | 400 |
| CVI | Cerebrovascular insult | 450 |
| Church | Perfect | 450 |
| CARE | Cover a**, retain employment | 500 |