tit leak
The accidental exposure of one's tit. Unlike sideboob, tit leak is always unintentional and may occur from head-on as well as from the side.
Girl 1: Hey, good morning!
Girl 2: Dude, close your bathrobe, you've got some mad tit leak.
Girl 2: Dude, close your bathrobe, you've got some mad tit leak.