Definition of "pooper"

pooper

noun
plural poopers
1. (vulgar, slang) The anus; often in reference to anal intercourse.
2. (slang) One who poops out on an activity; one who dampens the mood by lack of participation or negative attitude. Mostly used in the phrase party pooper.
3. (gambling) A selection in a slot machine game that ends the picking bonus.
4. (rare) One who poops; or, poops well.
  1. (by extension) An infant.
5. (slang) The toilet.
  Quotations
  "Here I sit, on the pooper, giving birth to a Maine state trooper."
  2001, Stephen King, “All That You Love Will Be Carried Away”, in The New Yorker
6. (Internet) Clipping of YouTube Pooper.
  Quotations
  For whatever reason – the terrible animation or the absurd dialogue, most likely – these cutscenes are popular among poopers.
  2012 November 3, Brad Evan Rosen, “YouTube Poop: Meme as Art, Community – by “William A – YLT2012””, in Yale Law Tech‎
  Many who disregard the medium are oblivious to the absurd amount of effort that some Poopers put into their projects.
  2019 March 20, Luke Dormehl, “YouTube Poop is punk rock for the internet age, and you probably don’t get it”, in Digital Trends‎
  But each individual YTP features something different, and different YTP creators (often called "poopers") use their own styles.
  2021 August 15, Ben Stegner, “What Is YouTube Poop?”, in Make Use Of‎