Ass Joint 

Bath tissue remnants deposited on and around Toilet rim. In extreme cases ass joints have been known to migrate to surrounding floor. Ass joints are created when inferior bath tissues are used on "rough" (many cases hairy) Anuses. The end result is a rolled tissue joint thats 420 for your 6:30.

I had no choice but to use the filthy public bathroom stall that was littered with Ass joints.

Ass Joint by dontshakedahand October 30, 2010

double jointed ass

The gift or ability of being able to produce powerful farts on demand.

It stung their nose and it burnt their eyes and it even scorched the grass, and I twigged right then and there "He's got a double jointed ass."

double jointed ass by silve-ja May 22, 2005