In the most basic form - vagina
Useage: To describe any woman in just about any manner. (see "In a sentence")
The visual: When a woman has her ass up in the air(from the "on her back" position) propped against something (like the edge of a bed) and she is basically laying on the top of her shoulders and the back of her neck. When she spreads her legs her vagina basically becomes a "Fur Cup".
Other names: beaver, clam, snatch, pink taco, wisker biscut
Used in a sentence:
"Check out that fur cup at the bar!"
"What's up fur cup?"
stuffed her fur cup last night."