Someone who exhibits lame tactics in competitive sports video games, usually against a human opponent. This could include but is not limited to running the same play over and over, using clock tactics, or anything else that isn't in the spirit of friends sitting down to waste time playing video games.
Player: "Man you're milking the clock in a video game? That's fucking twatballing, man"
TYAT stands for Think Your All Tuff. It can be used to describe a girl or guy that thinks they are way too tuff or cool and really are not, along the same lines as a poser. JJ is credited with this word but it has been blown up all over mv