the game of throwing small objects, such as little balls of paper, inside a girls shirt with the goal of getting it to go in between her boobs.
Bryan: Look at Jessica over there. I'm going to play cleavageball! I'm gonna throw this paperball inside her shirt.
Barney: You are going to miss! She doesn't have anything!
v. When the male sticks his penis directly into a girls "cleavage" aiming the head of his penis at the crack inbetween the girls nipples and fucks her tits.
"Dude!?, I Cleavagefucked my girlfriend hardcore last night down deep inbetween her cleavage while she was wearing her bra and very low cut tanktop and had a massive cumshot that ended up all over the top of her tits and both her bra and tanktop."
An eclectic sport where opponents try to make baskets by throwing small round objects into another player's plunging cleavage. Usually played with women.
Hilary scored a 320 in cleavageball last night, using Erica's double D rack.
A game in which a female wears a low-cut shirt and a man attempts to throw small balls of paper down her cleavage. The female then throws small balls of paper at the male's face. Every paper ball that goes down the girl's shirt or hits the boy's face is a point. Whoever gets the most points is declared champion.
Friend: "Why are you guys throwing balls of paper at each other's cleavage and face?"
Boy: "Oh it's a game called cleavagefacepaperball. The score is 3-5."