Hinge

The part of a female's anatomy where the butt meets the upper leg and overhangs, often creating a crease, if the former is large enough. The size of this overhang of the booty is dependent on their size and the protrusion of the arsecheeks.

(At the beach)

A: Hey bro, check out the hinge on her!
B: Goddayum, I'd open that out in no time.

by Wagwanathon March 11, 2014