when a skanky girl takes way to many cocks into her ass her ass becomes flappy there for givin her some butt flaps
by Insert It July 12, 2006
similar to mud flaps on a truck-butt flaps are a new fashion accessory. They come in plain, name brand, and chrome (popular with the ladies). Can be used to keep the dirt from kicking up while you're running or simpley to just say "Hey, look at my butt flaps!" Hopefully, one day, the famous rapper Little John will come out with his own line of butt flaps.
by Silly Sanfilippo December 22, 2005
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.
by nahthan November 11, 2005
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.
by special j September 09, 2007
by Marginallyclean July 12, 2016
when obesity causes rolls to protrude from the buttocks, causing a sort of 'flap' that at time may sway to and fro.
by buttflapexpert June 07, 2006
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!
Dee-bop: Tell me about it! I can see her butt flap from here!
by Buttl0af June 27, 2013