Keyboard Warrior
What does keyboard warrior mean?
A person that posts controversial opinions online
Example
"Wow, you're such a brave keyboard warrior for making an 11-year old cry."

Keyboard Warrior means a person that posts controversial opinions online
Related Slang
Usage
Last Updated: April 9, 2019
A keyboard warrior is a person who posts aggressive or controversial opinions online, typically while remaining anonymous. The term is used in a mocking manner to call out people who think they are "warriors" for sharing hurtful and offensive opinions online by typing on a keyboard but would not dare say those things in person.
Keyboard warriors are all over the Internet but you will most often find them "battling" other people on social sites and the comments section of articles and videos. Popular keyboard warrior battlegrounds include politics, sports, sexual identity, health, and Chrissy Teigen.