Smuggler's Den

Smugglers den is an act of sexual deviance wherein a man inserts his testicles into the anus of his female partner.
Most often when the balls are removed the exclamation "BOOYAH!" will be yelled.

-That chick is so freaky, she's down with the Smuggler's Den!
-Have you ever tried the Smuggler's Den? No, I don't think I could fit my balls in her ass.