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.
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!!!
The labia minora, or inner lips. NOT the majora, as many a moronic contributor would have you believe.
The piss flaps are a colloquial term for the labia minora, or inner vaginal lips, by virtue of being proximate to the urethral opening.
When a fat girl masturbates
I was watching porn and i saw a video of a 400 pound woman flapping the beef
Mud Flapping is when a guy challenges or questions another guy’s manhood based on the former not being capable of a feat that he himself has just proved himself unable to accomplish
Example:
MudFlapper: “Hey bro, you got a knife I could borrow?”
RealMan: “Sorry bro, I don’t have it on me.”
MF: “What?! A real man always carries a knife!”
RM: “YOU don’t have a knife idiot. Stop all your mud flapping and get out off my property.