Define What Cup Meaning

What's In That Cup?
Phrase, Used In Beer pong when a shot is taken and the ball should clearly go in but spins out, or the cup falls. Generally this is because of a low amount of beer put into the cup.

(*Perfect shot taken but spins out*)

Shooter: "What's In That Cup?"
By Tine
Hey Whats Your Cup Size?
what you ask dudes with huge bitch tits.

steve dave: hey whats your cup size?
damian: man, shut up kracka'
By Bernadina
What Cup
a cup you drink out of that asks you a lot of questions.

Father: *grabs a what cup and pours coffee in it and reads the newspaper*
What cup: Why did you just grab me? Who are you? Why did you pour coffee in me? What species are you? What the heck?
By Misti