A person, typically of the female variety, who is the clutch player in the game of Flip Cup or Beer Pong.
Joe: dude, that chick over there is a total Last Cup Queen.
Mike: you mean Ariana?
Joe: no, definitely not Ariana.
A person, typically a female, who is a clutch player in the game of Flip Cup.
Man: Damn dude, that girl Ariana over there is totally not a Last Cup Queen. She lost to that other girl over there by 4 cups.