A 'body flap buckling run' is when a greased up derby girl skates full speed into a man only wearing a sombrero, slaps his balls with a ping pong paddle, then lights his hair on fire.
She gave him the 'ole body flap buckling run!'
To overreacte, to throw a fit, to lose your temper; usually over something small
Also can be flapping your/a/my cracker, flapped your/a /my cracker
Example 1:
Bride: Oh my god! The white of the cake doesn't match the white of my dress! The wedding is totally ruined,we might as well just stop now!...
Groom: Honey, don't flap your cracker...
Example 2:
Guy 1: Where's Sue?
Guy 2: I don't know, she jusk flapped a cracker and took off.
Farting; flatulence - the act by which the gas from your bowels flaps the buttex cheeks together.
You might want to grab some toilet paper, those crack flaps sounded wet.
The manner in which a male's penis travels when walking if unrestricted by garmet(s). Only applies to biological men, "transgender" men don't actually have penises, despite the current narrative.
Girl at nude beach: Omg look at they's cock flapping in the wind while them slowly walks towards us! I am so going to suck it off!
Other girl: That's a biological male you dumb slut. And learn propper english you libtard.
The labia or “pussy lips” on an Uber-over-weight woman
Hey man, last night I had my face stuck in the piss flaps of Susie for close to an hour, I could barely breathe!!!