When someone slaps your arm twice (one with each hand) and then proceeds to snail (slide their hand under your arm) your arm, and then say double flap snail
Woah, that was one good double flap snail. ~S. Brown
When a man, typically an older man, has quite a saggy scrotum such that when they lay on their back and remove any under panties the scrotum will block the gooch area, thus creating a gooch flap.
Doctor: Time for your prostate exam. Oh my where is your anus?!?! Just kidding I found it, it was hiding right behind your gooch flap!!
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!"
extremely saggy pussy flaps, specific belonging to grannies
"Oi nanna let me cop a feel of those Granny Flaps"
A person with a freckle or freckles on their labia.
So I was about to go down on this girl but I couldn't because her freckle flap grossed me out