Booty Flaps in another word for ass or but cheeks. This is when a women has very round and perfectly shaped but cheeks. You can have small or large booty flaps but, to be a booty flap they must be of the highest quality of asses.
Yo Tom that chick at the bar last night had really nice booty flaps.
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Booty flap is when a girl flaps there booty so hard that whoever watches it, gets a little funky when they watch it.
The girl did a booty flap to the audience in Las Vegas.