A box used on old western films to hold the fake boobs of the gun totin' prostitutes. These prostitutes would were the fake boobs in order to get a wider audience. The box was usually made out of mohogany.

the thing that you don’t have when you’re phones percentage is over 20

The hitboxes of a character in a fighting game, especially of the breasts.

a girl's cleavage, especially if she has very large breasts, it makes for a large box