Stands for Wild Insane Loud Language.
Anger induced Tourette's Syndrome. W.I.L.L. can be heard when people play COD and begin to lose. Supposedly experienced for two reasons: the fun of raging, and because one is actually losing. Consists of lots of F's, S's, N's, GD's, J's, and pretty much every other known curse word.
W.I.L.L. is a very serious and very contagious disease. If someone you know contracts it, seek help immediately. Do not approach someone with W.I.L.L. alone, for this can be hazardous to your personal health. NEVER EVER EVER suggest they put down the video game. This will surely result in bodily harm.
Gamer 1: G**damn motherf**king piece of s**t bastards!!! F**KING F**K!!!!!!!!!
Gamer 2: Dude... You sound like you just caught W.I.L.L.
Gamer 1: F**k you, man! I'm playing with my frat brothers and our KDR is under 1...
Gamer 2: Ohhh... yea. You've got W.I.L.L. but with good cause.