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.
Gurl, those are some mighty fine butt flaps you got there!
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Butt Flaps is the part of the butt that flaps all over the place, and it is also the thing that most white people don't have, but the thing that black girls do have.
Synonyms: Butt cheeks, Butt, Buns
Omg you saw Sabrina, she has no butt flaps.. Lmao she tight.
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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.