Whilst this can be confused with the term 'Party Pooper', a slang term used to describe one who takes away the fun in a particular situation.
The 'Party-Pooper' is a prank that involves taking one's feces and placing it within an unused party popper. Once the party popper is pulled, the aforementioned feces is then shot out alongside the streamers.
Person 1: How was the party?
Person 2: It was pretty crappy once someone decided to pull a 'Party-Pooper'.