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One who breaks up or ruins a party through a variety of means. Possible ways of dispersing or destroying a party include but are not limited to: calling the authorities, stories involving octogenarian sexual intercourse, Jennifer Aniston movies.
Rich: Oh no, Larry! Here comes Harold.

Larry: He's probably going to come over here and talk about his wife. She just died. God, what a partypooper.

Rich: What a selfish bastard! What makes him think we care about that?
by The Master of Unlocking December 28, 2009
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8
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.
Jimmy's such a party pooper, He recked our squad in fortnite. And now he's blaming it on me >:(.
by AQUALIME April 11, 2021
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10
Someone who ruins fun by not participating in a certain activity even though they were given advance notice.

a tall, talented bike rider who wears tight jeans
jarrett moore is a fucking party pooper, were going to lucky and he won't come cause he has to stuuuuudy the next day.
by Martin luis. October 24, 2009
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11
Someone who ruins a party by getting totally wasted and shits on the floor, the couch, his friend's polo, the wall, and many other places. As well as shitting all over the place, a Party Pooper can sometimes also throw up underneath a dog bowl, piss on the kitchen floor, or on someone's shoes. The Party Pooper usually awakens the next morning covered in his own shit, vomit, and piss. The Party Pooper flees the party house in a state of confusion, leaving his disgruntled friends to clean up his disgusting mess.
A classic example of a Party Pooper is Tyler Price, who did everything that is described in the definition.
by Gaz55 February 18, 2008
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12
Before ejaculating on your partners face, shove a handful of confetti in your anus. After ejaculating quickly turn around and fart out the confetti on your partners face causing it to adhere to the semen. Often followed up by the male yelling "Surprise!"
I had leftover confetti in my house so what else would I do? I gave her a party pooper of course.
by papasmurff September 19, 2010
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13
A group of friends who goes to parties without participating in the party, which therefore often kills the mood.
- See who just walked in through the door, it's prutskid and friends
- Oh, they're such partypoopers
by Mr. meeeeeeeeeee March 25, 2011
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