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1.
The hymen of the ass. Of course, it doesn't actually exist, but it's something in the same vein as how the vaginal hymen refers to female virginity.
"Dude, did you break your ass hymen?" (...lose your anal virginity?)
by BFM_OD March 06, 2008
 
2.
What is broken by gay men/those that engage in anal. Signs the next morning include limping and poop dick. Also could be broken by something doctors do, aka prostate exam. If it gets broken and you are straight, it is a great source of humiliation and probably a good reason to kill yourself
Jack-"I wanna put in your butt"
Some girl-"I don't think we should"
She does
Jack-"Oh my God! You just shit everywhere!"
The breaking of her ass hymen...memorable to everyone
by Almost Fantastic Dan April 07, 2008