boob crev 

The dark side of the boob, the fold under the breast.

"I heard that Nicole decided to dress up as Steve Urkel for Halloween."
"Yeah, it was a great costume, except that she had her pants pulled up under her boob crev. Not very Urkel-esque."

boob crev by Malingergeist April 30, 2015

Boob crevice 

The indention between two milk sacks

"Ashlyn has a really nice boob crevice!"

Boob crevice by winterhess August 1, 2015