What someone has when they only have courage to start fights, be racist, or talk shit when they're commenting on YouTube. Someone grows YouBalls when they know that they're hiding safely behind their computer and can't get their ass kicked.
Making an example up, but there not hard to find :D
-video of a cat-
Person 1: I think that (insert random non topical post here)
Person 2: wtf, (insert random answer to non topical post here)
Person 3: Stop having a youbate