Ninja Shits 

When you have finished going Number Two, and suddenly feel more on the way.

"Man, got half way out when I got struck by Ninja Shits"

Ninja Shits by Ormagoden September 1, 2014

Ninja shits 

When diarrhea or mexican food sneaks up on you at a random time.

Boss: "Why weren't you at work Bob?"
Bob: "Well I was at my daughters play then i got a case of ninja shits."

Ninja shits by Chupa Mi Verdga August 10, 2014