Ass Flap 

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!"

Ass Flap by OTJdog March 26, 2017

Ass flap 

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.

Ass flap by TedZeppelin March 3, 2007

ass flap 

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.

ass flap by sluttya$$tay December 31, 2017

Ass flap 

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!"

Ass flap by 1911a1 September 5, 2008

ass flap 

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.

1]Dude, look at that wannabe punk rocker! He's wearing an ass flap!
2]Yeah, and a cock flap too!
1]What a tard.

ass flap by BentBackTulips January 2, 2009

Ass-flap 

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.

Ass-flap by UberCyberBeast August 1, 2008

mud-flap ass 

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

mud-flap ass by Mudflap crab November 25, 2022