To bail on a plan. Usually with a pitiful excuse. If the person does this often enough, they become the queen of flaps.
Also can use Flap
Jed - "Sorry, I know I said I'd come but I have a cold."
Sam - "You're flapping then?"
Jed - "No I just dont feel well.
Sam - "Dont flap man! It will be more boring."
Amanda - "This is the 5th time you've done this now Jed. You're becoming the queen of flaps."
Jed- "Fine I'll go."
The act of masturbating with an uncircumcised penis.
Guy 1: Hey man where's Ethan at?
Guy 2: Dude he's totally in his bathroom flapping.
An idiot who is incessantly flapping there jaw at you or in your ear possibly spit coming out of the idiots mouth.
Meaning: Could you stop flapping in my ear man why can't you just shut the fuck up!
Stop flapping in my ear man! step back! give me some fucking space and shut the fuck up.
Flapping. The act of farting laughing and peeing at the same time.
I was standing in the yard flapping.
where a white overweight man screams the nword at a black dog/cat while jumping up and down flaping their tits
i saw mitchel owen flapping over there.