When your mouth overides your ass. Talking way way to much about nothing. Not being able to stop talking.
Dude: that guy won't shut the fuck up!
Girl: yeah nigga, he's got a bad case of flapping yap syndrome.
Girl: yeah nigga, he's got a bad case of flapping yap syndrome.
by Nick"o"letty November 5, 2022
Get the flapping yap syndrome mug.I made an advance on my boyfriend, but he flap slapped me because I told him his brothers dick was bigger.
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Get the flapped mug.Large fanny flaps, often found on females but potentially discoverable on males. Resembles a pair of scuba flippers! usually quite lengthy...
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