When you go down on a lass, spread her legs to open the heavenly gates, as you go down on her you do a loud burp right between the flaps. ( excessive amounts of either alcohol or gas-inducing drinks help with vibrations)
(Dan) Do you remember that 'Shiela' from the bar last night Shane?
(Shane) yeah the one with the fat arse?
(Dan) yeah mate that's the one, well I took her home and after all that beer.......I had to give her the good ol' flap burp!
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.
The genitalia of an elderly man, or the breasts of an elderly woman.
John "Man, I heard that once you hit the age of 60, you start to develop a flap pack!"
Chris "Isn't that true!"
The vagina of an extremely intelligent, educated, nerdy woman, preferably wearing glasses.
What do you want to do tonight bro? Man I really want to go find me some me some Nerd Flap!
Man I just landed a BAD bitch with a PHD! I'm officially upgraded to some Nerd Flap!
When your so fat you loose stuff in your fat.
She's buff on her insta but I bet can flap trap in RL
Foul smelling odour emanating from the vulva majoris.
Damn! That girl has Smelly Flaps Syndrome (SFS) . I can smell it a mile away.