The act of playing basket ball but will small paper balls and a woman's boobs. The paper ball being the ball and her boobs being the basket. Usually done without permission.
Guy 1: Wana play some boobsket ball with her?
Guy 2: sure.
*Guy 1 shoots and bounces off*
Girl 1: What the hell?
*guy 2 shoots and goes down her shirts*
Girl 1: What the hell!?
Guy 2: YES!
The game of throwing small objects of any kind down nearby women's cleavage. The more cleavage there is the more fun it is to play. It's like basketball, except with titties.
Dude 1:Hey manwant to play some boobskeball.
Dude 2: Sure, alright that small rack is 2 points and that huge pair over there is one.