An individual, usually unknown, who defecates in improper places, especially when the discovery of the evidence is an unpleasant surprise.
"When Mr. Jenkins reached into his desk for the hall pass, he discovered that the Mad Pooper had struck again. The whole school heard the scream."
by MrClarke2014 April 15, 2014
by Steve December 22, 2003
by Sexdrivehigh November 14, 2010
by the_dude August 15, 2006
Someone who ruins a party by not participating in something, or not making the party not fun in some way. Or doing stupid stuff to get attention and accidentally doing something bad and now everybody hates you even more.
by AQUALIME April 11, 2021
Guy 1: can you make a youtube poop with 7 Grand Dad in it?
Youtube Pooper: thats actually what im working on
Guy 1: nice!
Youtube Pooper: thats actually what im working on
Guy 1: nice!
by Malleo Malleo August 31, 2022
by Hells Wrath February 05, 2009