| J/K | Just kidding | 200 |
| JK | Just kidding | 200 |
| Jump the shark | To decrease in quality | 125 |
| JFGI | Just flippin' Google it | 200 |
| Juggalo | A fan of Insane Clown Posse | 300 |
| JP | Jurassic Park | 233 |
| JLo | Jennifer Lopez | 300 |
| JCI | Just checking in | 350 |
| Jock | Athlete | 300 |
| JLUK | Just letting you know | 300 |
| Juiced | Excited | 400 |
| Juice | Power and influence | 400 |
| Jet | Leave quickly | 300 |
| Jerry | Baby slime | 250 |
| J/W | Just wondering | 300 |
| Joshing | Joking | 200 |
| John | Toilet | 250 |
| Juking | Using items in the environment and moving around to escape | 350 |
| Joyous Murray | A meme featuring a joyful Bill Murray | 250 |
| JRPG | Japanese role-playing game | 300 |
| JTO | Just this once | 350 |
| JAG | Just a guy | 250 |
| JPY | Japanese yen | 300 |
| Jailbait | Attractive underage person | 233 |
| Juggalette | A female fan of Insane Clown Posse | 300 |
| Joint | Place | 300 |
| j | Joint | 250 |
| Jorts | Jean shorts | 250 |
| J4F | Just for fun | 250 |
| J | Joking | 350 |
| JIC | Just in case | 350 |
| JS | Just saying | 320 |
| J/P | Just playing | 300 |
| JW | Just wondering | 350 |
| JIT | Just in time | 350 |
| JAS | Just a second | 300 |
| JFK | Just freakin' kidding | 300 |
| JC | Just checking | 300 |
| JLMK | Just let me know | 400 |
| J4G | Just for grins | 300 |
| Jam | To pitch near a batter's hands | 350 |
| Js | Jordan shoes | 340 |
| j | Jump shot | 400 |
| Jazzed | Excited | 400 |
| JMO | Just my opinion | 400 |
| JC | Just chilling | 400 |
| Jaguar | An older woman who dates younger men | 400 |
| JP | Just playing | 400 |
| Jonerys | Jon and Daenerys | 350 |
| JA | Just asking | 300 |
| JMHO | Just my humble opinion | 400 |
| Juslim | Jewish and Muslim best friends | 350 |
| Jesus jeans | Jeans with a lot of holes | 350 |
| Joe Pesci | A difficult five foot putt | 350 |
| James Joyce | Putt that is hard to read | 400 |
| JOMO | Joy of missing out | 380 |
| JTM | I love you | 333 |
| JSYK | Just so you know | 240 |
| Joint | Marijuana cigarette | 220 |
| JC | Just curious | 400 |
| Jookin | Footwork-based dance move | 400 |
| JAM | Just a minute | 400 |
| jelly | Jealous | 275 |
| JFF | Just for fun | 400 |
| Jungler | A jungle killing player | 350 |
| Jungling | Killing neutral monsters in the jungle | 250 |
| jab | Injection | 400 |
| Janky | Of poor or inferior quality | 350 |
| Jockin my style | Copycatting | 400 |
| Jaffas | Cookies | 400 |
| Jockin | Copying | 400 |
| JAF | Just a friend | 500 |
| jc | Jewelcrafter | 500 |
| J2LYK | Just to let you know | 500 |
| jb/c | Just because | 500 |
| JJWY | Just joking with you | 267 |
| JFI | Just for information | 233 |
| JOOC | Just out of curiosity | 450 |
| JJ | Just joking | 340 |
| Jellz | Jealous | 500 |
| jbc | Just because | 500 |
| Jackpotting | Winning | 300 |
| JUIL | Just you I love | 500 |
| JASE | Just another system error | 450 |
| JJA | Just joking around | 500 |
| JTLYK | Just to let you know | 267 |