Going further back, YouTube Poop can be compared to the Dada art movement of the early 20th century, which was based on being nonsensical. If the other characters experienced it as well, it would be indistinguishable from YTP.
The video was well-received, and SuperYoshi together with his friend RetroJape made similar remixes using the Mega Man cartoon and later Adventures of Sonic the Hedgehog. 3 Remixed" on December 22, 2004, up on his SheezyArt page. Later he put this video as "The Adventures of Super Mario Bros. The result was a video containing a few clips from the episode repeated and used in a random manner.
YouTube Poop started with a guy named SuperYoshi testing out Windows Movie Maker, a new piece of software he found in his newly installed Windows XP, using the episode "Recycled Koopa" from The Adventures of Super Mario Bros. There are also well-known phrases used such as "PINGAS" or "Do a Barrel Roll!". The source material can be mashed all together into a nonsensical Crossover story, or just repeat footage of the characters gesticulating oddly or apparently saying something dirty over and over and over again.
YouTube Poop (often referred to by its shorthand, "YTP") is a Neo- Dada art form consisting of video remixes that are edited from a large array of video clips in order to confuse, stun or entertain the viewer.