ass ninja 

One who engages in anal sex so quickly and stealthily that the other person is unaware that it has occured.

Bobby was in and out in 9 seconds. He is a true ass ninja.

ass ninja by FAH Q 2 January 20, 2006

ass ninja 

ninja's that spontaniously spawn from ones ass.

'Goddam, i had a bit of trouble with some ass ninja's this morning.'

ass ninja by Prycey September 9, 2003

ass ninja 

A mythical being who exists to give people wedgies. As with the Tooth Fairy, Santa Claus and the Easter Bunny, the Ass Ninja visits all the little boys and girls in order to bunch their underwear at the worst possible times.

"Dude I totally just got visited by the Ass Ninja! Cover me while I pick my underwear out of my butt."

ass ninja by Dark_Angel August 25, 2012

Ass Ninja 

a practitioner of the ancient art of ninjitsu, who happens to enjoy smoking the occasional wiener.

The guy that lives accross the hall from me is an ass ninja

Ass Ninja by Dusitn for Pres in 96 April 24, 2005

ass ninja 

gay guy who likes anal

ass ninja by Jesus June 6, 2003

ass-ninja 

A ninja warrior who, quite literally, kicks ass. They aim straight for the buttocks and pummel mercilessly. See also: 'munkfuck

"Man, we got so raped by those ass-ninjas!"

ass-ninja by Snnnnickerdoodle January 29, 2007

bird ass ninja

a sensitive asian guy, an asian guy who likes birds

Leon is a real bird ass ninja, he gets upset when he is not svelte.

Leon likes birds, so he must be a bird ass ninja.

bird ass ninja by DrJK December 21, 2010