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A hole located in the backside of the boxers of an individual who puts his/her boxers on backwards
*group enters hot tub*

Friend 1: "Look at this clown! He put his boxers on backwards!"
Friend 2: "Would'ya look at that! I've got an ass flap!"
by OTJdog March 26, 2017
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3
an extraneous piece of skin or webbing that covers the anus
Before we had the sex, I had to lift up her assflap.
by Gooney Goo Goo April 09, 2003
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4
the slit in the seat of a pair of longjohns or union suit
"john forgot ta open the assflap and shat all oner hiz longjohns"
by hemp March 11, 2005
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5
1. the small growth of skin that occassionally covers the anus of newborn children. Such growth is customarily removed and discarded. 2. someone who is disgustingly useless.
"Get off the couch and take out the garbage you ass flap!"
by 1911a1 July 06, 2006
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7
butt opening on onesie commonly used for easy access
I like to get frisky in my PJ’s so the ass flap is very convenient.
by sluttya$$tay December 31, 2017
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