(noun) Any dog that can catch a frisbee or jump more than one and a half times its own height. These athletic feats of agility distinguish certain dogs as ninjas instead of regular shit factories.
by Scrapheap Markus January 3, 2008
When you take a particularly nasty shit in the bathroom of someone you hardly know, then tell no one, like a true ninja master.
Holy shit dude, I am pretty sure that Rachel's friend whatsherface, ninja deuced us last night. Thats the last time i have her friends over for Mexican food, twat.
by Arsenal89 July 21, 2008