To leave a game that's in progress due to the fact that the person in question is full of anger.
"Kevin has left the game"
A: What happend?
B: I don't know, but it seems like a ragequit.
When Khazra ragequits from Empyrean for being muted for 100 years.
Astrazar: ?mute @Khazra 300y
Khazra: *ragequits*
Astrazar: Inappropriate ragequit