The sport in which often a male tries to throw a spherical or cylindrical object, typically a coin, gumball, wad of paper, or popcorn, down a woman's displayed cleavage.
This sport originates from a middle or high school pastime of boys simply being bored and wanting to play basketball with girls. The lack of a basket caused men to use women's cleavage (note can also be played with an overweight man). It has spread to the public and is a common occurrence when friends chill with females.
Baker made popcorn for her friends, and Howard decided to take advantage of the opportunity and play breasketball with Baker's 34B's.