Noun:
The butthole.
Verb:
The opening of the anus.
Synonyms:
Corn Chute, Turd Tunnel, Crap Cannon, Shit Shooter, Balloon Knot, Monkey Button, Portal to Paradise, Stink star, Hershey Highway, Shit Pit, Brown Eye, Chocolate Starfish, Rusty Bullet Hole, Rusty Sheriffs Badge.
Shaun: I was in the French Opening yesterday for my first time!
Kurt: Oh, I love tennis!
Shaun: No, I mean my boyfriends French Opening.