Pooper

Noun

 * 1)  The anus; often in reference to anal intercourse.
 * She likes it up the pooper.
 * 1) (in the term party pooper) One who poops out on an activity; one who dampens the mood by lack of participation or negative attitude.
 * 2)  One who poops; or, poops well.
 * Jimmy's toilet training is finally over; he's becoming a good little pooper.

Synonyms

 * shitter (UK), WikiSaurus:anus