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An ugly, stretched out asshole. Usually caused by an excess amount of anal sex.
Man, your mother looks like a rejectum!

My rejectum isn't as large as Erika's!
by Scott Pavek April 17, 2005
Ugly, smelly stretched out asshole.
Last night I went to stick it in Kelly's ass, but she most deffinetly had a rejectum
by Rikky April 17, 2005