Big Ass Titties. An acronym used to describe large, bouncy, voluptuous, milk-filled, mouth-watering, motor-boating, bitching breasts on a female.
Often uttered to express approval of a woman's breasts to another person without saying the full expression as to avoid confrontation, contemptuous looks, and/or possible sexual harassment allegations.
Bro 1: Dude, check out the bats at 3 o'clock.
Bro 2: I'd suck on those bats like my 4 year old brother on my mother's tits.