I don't rage quit in multiplayer games. I'll wait till the match is over and then just be like "Well, I'm done." Oddly enough, I seem to have a good level of patience with people.
With machines on the other hand.... I dunno. If I hit a wall where a game is too hard or glitching out or being cheap or something, then I might rage quit and come back to it later. I don't recall exactly what I say when I quit though, usually I'm too busy verbally bashing whatever specific part of the game is pissing me off at the moment.
For example, playing Demons Souls in the prison level, there's a woman in the background who constantly sings the same two tunes. So until you find her, you just hear "OOOOH! Ooooh! OOOOOH! Oooooh!" over and over again. So dying a few times in that game prompted me to be like "God, stupid fucking game! You're only winning because of that dumb *****'s singing getting on my nerves! OOHHH! Ohhhh! OOOOH! Oooooh! You sound like a fucking donkey! Eeeeh awwww! Eeeeeh awww! That's you, *****. That's YOU!" I only remember that one because my brother and his girlfriend burst out laughing.
I guess I don't have a line when I rage quit, but I have a quirk. I talk AT the game, insult it like it can hear what I'm saying, and at times I'll "imitate" it. You know, like "Uggggh, look at me! I'm a cheap piece of dog shit who sends out fifty enemies to kill one guy! Go eat a dick, I'm done with this shit!"