Your Mom
End everything anybody says with "your mom." Trust me, it'll become a game... a game that you will win every single time. Make it so that if they say "your mom" back at you, it counts as a repeat and repeats automatically lose. If they happen to say "your mom" first though, you can say "your mom" back on account of being better than them at the game, and in which case, you will win, because there is nowhere for them to go except to just admit their defeat and their utter worthlessness as a human being.