butt-flap 

A piece of cloth attached to the back of your pants or jacket covering the lower portion of your back. Usually screen printed with punk rock logos, insignias, and covered with conical or pyramid studs. Worn by punk rockers of all kinds. Extra bonus points are rewarded if your butt-flap attaches to a studded vest with pyramid or conical studs. The first known sighting of a butt-flap was as ABCNORIO in the lowe east side of New York city in 1989, although it is suspected to have originated in London at an earlier date.

"Dude, that bass player from Impaled has a killer butt-flap! Check out his vest"

butt-flap by nahthan November 11, 2005

butt flap

A square piece of cloth (usually advertising a punk band) that is safety pinned to the back of a dirty, smelly, gutter punk kids pants. Similar to a trucks mud flaps and a loin cloth.

Why do the gutter punk kids wear those butt flaps? They are so ugly!

butt flap by special j September 21, 2007

butt flap

when obesity causes rolls to protrude from the buttocks, causing a sort of 'flap' that at time may sway to and fro.

omgz my butt flap, someone help, need butt flap assistance

butt flap by buttflapexpert June 11, 2006

butt flap

When a person's butt is so flabby that it hangs low to create a curtain of flabby butt. Otherwise known as a butt curtain.

Trisha: That gurl does not have the bod to pull of those bootay shortz.
Dee-bop: Tell me about it! I can see her butt flap from here!

butt flap by Buttl0af June 29, 2013

butt flap

A loincloth. A term used first in George of the Jungle, but most notably in George of the Jungle 2.

"He keeps the deed in his what?"
"His, um, butt flap..."

butt flap by Pandaran January 27, 2007

Khaki Butt Flap

When you have diarrhea and use it as lube for anal, then smack the ass cheeks with both hands as you enter

Fuck man, I gave her the gnarliest khaki butt flap the other night after eating Chipotle.

Khaki Butt Flap by Alan Lights January 7, 2023

Musical Butt Flap

A rhythmic or structural "stumble" in a song’s arrangement. Usually occurs when a drummer plays a ghost note exactly one sixty-fourth note after the downbeat, or when a track has a deceptive ending that "flaps" open for one final, unexpected instrumental flourish. It creates a physical sensation of the groove having a loose tail or a "shaky" low-end vibration.

"I was trying to map out the scansion of that new jazz fusion track, but the drummer kept throwing in these greasy butt flaps on the bridge that completely wrecked my meter."

"The scansion of the lyrics is actually quite formal, but the producer added so many sub-bass butt flaps to the chorus that you can't even tell it’s written in iambic pentameter."

"Check the scansion on that outro—the song technically ends on the fourth measure, but that final musical butt flap makes the rhythm feel like it’s tripping over its own feet."

Musical Butt Flap by FingPat April 24, 2026