RhymeZone: pooper definitions

Definitions of pooper:

noun: (vulgar, slang) The anus; often in reference to anal intercourse.
noun: (in the term party pooper) One who poops out on an activity; one who dampens the mood by lack of participation or negative attitude.
noun: (gambling) A selection in a slot machine game that ends the picking bonus.
noun: (rare) One who poops; or, poops well.
noun: An infant.
noun: (slang) The toilet.

(Definitions from Wiktionary)