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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When a rogue bit of toilet roll gets stuck to your sphincter during wiping.
It was a textbook turd until I snagged an ass flap.
by TedZeppelin March 2, 2007
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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 6, 2006
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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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A piece of cloth (usually a dark color, most likely black) with a logo or picture of a band on it that hangs over a "punk" persons ass, therefore supposedly showing their undying gratitude for the band. Can also be worn over frontal region, in which it is called a "cock flap", even on females.
1Dude, look at that wannabe punk rocker! He's wearing an ass flap!
2Yeah, and a cock flap too!
1What a tard.
by BentBackTulips August 20, 2007
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A tag of skin on the anus sometimes left behind by a resolved ass-grape.
Her ass-flap was a sign that she was predisposed to ass-grapes, but I sodomized her anyway.
by UberCyberBeast July 10, 2008
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The skin that causes the sound of a fart located on the anus.
That sucks ass flaps.
by andyfellovernet October 28, 2003
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