Dangling Clam
The rear view of a vagina when a woman is standing up straight with her legs slightly spread. The best view of a dangling clam is when one kneels so that his or her head is slightly below the woman's butt cheeks. This view is so named because the vagina in this state looks remarkably similar to a clam that is hanging and has it's widest face facing perpendicularly towards a person's eyes.
Yo Brian, check out that hot dangling clam over there. We can all see her vagina and she is none the wiser because she isn't even bent over. Fuckin' clam bake over here.