Meaning of party pooper

par'ty poop"er

Pronunciation: (p'pur), [key]
— Slang. 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. Also called
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.