When a woman bends down and you barely see her ass crack. Most commonly seen when woman are wearing jeans.
Jack: Hey John. that waitress over there just dropped our food all over the floor...
John: Yes she did, but did you see that crack of heaven when she went to pick it all up?!
John: Yes she did, but did you see that crack of heaven when she went to pick it all up?!
by Bobby Night September 15, 2013