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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

Flange flap folder 

The sexual partner of a girl who has such large labia they need to be tucked away in order to enjoy sexual gratification
Johnny's girl's flaps are so big he's had to turn into a flange flap folder just so he can bang her

Mississippi Mud Flap 

"If I see anyone with a Mississippi Mud Flap, I'm going to slit his neck, and shit down his throat."
John Flansburgh, one half of They Might Be Giants. Distinguished by the fact that he plays guitar, but he also writes songs, sings, and directs videos on the side. Is the "showman" of the band, and is generally considered the more outgoing and friendly half.
"I'm more of a Flans-fan than a Linnell-fan, myself."
flans by fanoflans March 22, 2004

six flags new england

theme park located in Agawam, MA with the popular rides Batman, Superman, Flashback, etc. and has hurricane harbor. it's pretty small and expensive. its nothing special.
"Have you been to Six Flags New England yet?"
six flags new england by bric January 22, 2009

Flap Rash 

The reddening and abrasion of the (skin) from your (wrist) to (armpit) caused by placing ones' (fist) and (arm) through an access (hole) in a flight surface.
Damn Bruce, Nice case of Flap Rash, I haven't seen it that bad since Bob oversized nine holes.
Flap Rash by Crazy Richard February 11, 2005