When a person gets so angry while playing a game, that instead of rage quitting, they become a diabolical plotting beast of pure skill and dominate the game they are playing.
Crappy Player-"AAAAAAAAAAAAAARGH MOTHERF-CKERS" (A few minutes later) "Hmmm top of the score board, HAHA BITCHES!"
"So how'd you do on that tournament yesterday?" "Well I was losing then I started Rage playing." "What?" "In other words everyone was utterly destroyed."