butt knuckle 

(noun) The popping sound made by an explosive fart. A crisp and short passage of gas from ones butt.

Excuse me while I crack my butt knuckle.

butt knuckle by Jay Hoe September 7, 2009

butt bonding 

A male on male sexual activity that occurs when neither partner is too tired or too straight.

Only one day into what seemed an innocuous road trip between friends, Cole and Derek suddenly came to the realization that their relationship could no longer be bearably platonic, and they engaged in the sexual abandon and high art of butt bonding.

butt bonding by Detective Kernel January 23, 2011

butt snap 

When someone farts, and the end of the fart is still stuck between their asshole and butt cheeks, then you squeeze your ass tight with your muscles and produce a snapping sound,

I farted and then snapped it, that produced a butt snap

butt snap by DanOfEdm April 4, 2006

Butt-Nutter 

Something quite humorous and amusing.

"Man, these letters to Santa are real butt-nutters!" --Philip J. Fry, protagonist of Futurama.

Butt-Nutter by PacificJohnny May 9, 2005

Butt Fuckled 

v. When butt fuck meets tickled.

Peter butt fuckled Sally.

Butt Fuckled by XirC December 4, 2010

butt ugly 

As ugly as buttocks. Mostly like large, hairy and deformed buttocks.

(Not Jennifer Lopez's buttocks)

That bitch is butt ugly

butt ugly by Funky Big Geek Freak Booty Daddy March 10, 2003

butt floss

a.k.a. g-string

Gina is wearing butt floss today!

butt floss by Mike February 17, 2004