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party pooper

[poo-per]
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noun Slang.
  1. a person who hasn't the interest or vitality to participate actively in a social party and whose mood, attitude, or personality lessens others' enjoyment; killjoy.
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Origin of party pooper

First recorded in 1940–45; poop2 + -er1
Also called poop.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for party pooper

party pooper

noun
  1. informal a person whose behaviour or personality spoils other people's enjoyment
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Word Origin

C20: originally US
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012