Hey mom, last night I slapped my flaps!
Mom? Do you slap your flaps?
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1. it is the opposite of im just busting your balls and or female version of im just busting your balls.
2.it is a quick comeback to make fun of a guy implieing he doesnt have his manhood instead he has a vajj.
your friend is getting vagitated with something you said and you reply its ok buddy im just slapping your flaps.
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