"Cleanage Girl" - Recent Pop-Punk slang for a generally clean seeming teen girl (particularily of the "preppy" nature). The type to wear Holister, American Eagle, Abercrombie, etc.
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 Jessicaover there. I'm going to play cleavageball! I'm gonna throw this paper ball inside her shirt.
Barney: You are going to miss! She doesn't have anything!