Similar to cleft lip, flapped ass is a chronic condition in which either of the two glutei maximi (buttcheeks) recedes to form a significant gap, aside from the gluteal cleft (buttcrack).
1. "1 in 3 children have been diagnosed with flapped ass. For 15 cents you can save a child's ability to sit in a non-tilted position."
-"ROFL"

2. "Yo why is my right butt cheek so much bigger than the other?"

- "HA YOU HAVE FLAPPED ASS"
by thatoneguywhosaysstuff February 24, 2011
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A woman in a bathing suit who has an extra flap of skin over her ass. It is most disturbing when she bends over. No one knows how it got there, but there it is, a flap of skin right over her ass.
John: Did you see that woman's ass?
Sara: Holy cow, she has a flap ass.
by Holycrapthisisawesome June 21, 2007
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When her ass phat but it ain't got no shape. Just long and wide with no atmosphere.
Damn Breanna got a mud-flap ass, a real dumper

Yeah, too bad it doesn't have any shape
by Mudflap crab November 26, 2022
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1. Shear extreme surprise.

2. The flapping of a holy ones ass cheeks, such as the pope.

3. When something so crazy happens that Jesus applauds you with his ass cheeks.
-A ass ninja flys out of nowhere briefly and then disappears into the shadows.-

Justin: Holy flapping ass cheeks! Did you see that ass ninja!

Matt: ....... -Slaps Justin for shear stupidity and then quickly disappears just like the ass ninja-

Justin: -After realizing that Matt was the ass ninja- Holy flapping ass cheeks!
by Mirthmanx December 15, 2010
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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 27, 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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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 January 1, 2018
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