To decline a rematch after winning a game on a chess server. The term is meant to insult the winner implying that they were lucky and that they are avoiding a rematch where they would likely lose.
Oh come on man, we played 2 games and I was just getting into it. Don't winquit.
The act of acquiring a Windows computer when you really wanted a Mac. Often followed by periods of suffering, self-loathing, re-booting and inadequacy.