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A theoretical fold of mucous membrane occluding the rectum. This structure is only present in anal virgins, and is broken upon anal penetration.

Anal counterpart to the hymen.
Hell yeah he's a player - he broke my butt hymen after our second date.


This man's butt hymen is ruptured! Call a doctor!
by Inuit Dust Commando! October 29, 2004
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2
joe "dude she cryed when i stuck it in her asshole"

John "must have taken her butt hymen"
by blacknasty July 10, 2008
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