Clown's Pocket

A disturbingly loose and sloppily unattractive vagina, reminiscent of the oversized, floppy pocket on a traditional clowns' costume

"I should have known, considering what a slut Tina was. Her fur pie was stretched wider than the collar of a fat kid's t-shirt. I could have fit six of my dicks in her clown's pocket!"

or another version:

Referring to (generally in a male) an anus that has been widened by constant buggery. Usually a clown pocket belongs to a victim of anal rape. The name comes from the severe wideness of it being likened to that of a clown's pocket.

"You've got an arsehole the size of a clown's pocket!"

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