The metaphorical hymen of the anus. Like the hymen, this is "broken" upon penetration to the aformentioned area, eliminating the subject's anal virginity.
by Silly Whitey November 9, 2003
An imaginary version of a woman's hymen that is inside the anus of every gay man. It is "broken" the first time he is anally penetrated.
by Scoots April 14, 2003