Top definition
When someone (usually a female) wears shorts so short that the lower curve of her butt-cheek is exposed, much like cleavage showing from a low-cut shirt.
Most American Apparel models have a butt-titty hanging out of their shorts.
by Stellokronix March 25, 2009
Get the mug
Get a Butt-titty mug for your Aunt Larisa.