Any persons, male or female, who deposits fecal matter that has such strong nauseating odor that he/she has to lift the front of their shirt to cover their nose, therefore resembling a ninja.
"Man, after I ate all of that limberger and ice cream I had to run to the bathroom and take a smelly ninja shit.
by Reggy Reigns April 21, 2005
When some takes a number 2 so quickly and quietly that the person must have the shitting skills of a Ninja.
Lawrence, you were in the bathroom for 30 seconds and you have created an odour that reminds me of a dumpster behind an Indian restaurant. That Ninja shit was so quick and quiet that I hardly noticed that you were gone.
by Cringer February 04, 2009
Its when you take a big solid shit kicking its way out of your ass, the head sticks out of the water and you think (i'm gonna need a plunger to beat this fucker down), thers no need to wipe, and when you fush it disappears in a cloud of brown mist!
The ninja shit almost made me shit my pants, i got it out and went to beat it down with a plunger and the fucker disappeard in a cloud of mist!
by ratso August 10, 2012