Mystery Poop 

The act of taking a poop, in which you know you pooped, however, there is nothing in the toilet bowl to flush except the bum wipe.

Mystery Poop is one of those unsolved mysteries.

Mystery Poop by Poohzie May 27, 2009

Mystery poop 

When you find poop in a toilet but there is no toilet paper in the bowl .

Someone took a dump in the toilet and there is just poop floating, no toilet paper. It’s a mystery poop.

Mystery poop by Stanovich June 30, 2020

Mystery Poop 

to go into a freshly cleaned public restroom, dropping a fat deuce, not flushing, and exiting the restroom unidentified.

someone dropped a fat deuce in my restroom the other day. It must have been the mystery pooper!

Mystery Poop by TheMysteryPooper December 29, 2010

mystery poop 

After performing the act of dropping a deuce, refers to the absence of leftover feces about the buttocks. Therefore, leaving nothing behind to wipe. It's a mystery.

I love mystery poops, there's nothing to clean up after.

mystery poop by Long-Dong Silver October 30, 2008

mystery pooper 

A loud fart is heard when you think you are alone in a restroom.

I thought the restroom was empty, then a mystery pooper announced his presence with a huge, vibrating fart from the stalls.

mystery pooper by Jackson Elms June 27, 2017