disruptive chatter, idle chit chat/gossip,
casual social conversation
possibly an allusion to sound created by a jib sail 'flappin' as wind flows past
Quit flappin' ya jibs and get back to work!
The phone rang while I was flappin the crap hamper.
-ridiculous commentary, from an unwanted source, seebitch ass
excessive talking from women or womenly men
Stop flappin your ass back their!
If I hear any more ass flappin, a bitch is gonna get a slappin!
what came out of my mouth when trying to say "god damn lollipop" while trying to get a lollipop out of the wrapper while shroomin
"my copper flappin lollipop!"
What you do when you are tweakin your head off
Man, you're flappin your F'n lid off!! Damn!
In other words, juss sassin' ya. Comes from da playful-but-annoying practice of coming up behind someone who's wearing a long jacket with a divided lower back, grabbing da jacket just above da slit, and then vigorously/rapidly yanking da lower part of da jacket in and out to make da pair of tails slap against da person's butt.
Me: If yer too warm, why doncha go take a dip in da ocean?
You: Jump in da ocean??? Are you crazy??? It's chilly and whitecaps-windy out there!
Me: I know, I know... juss flappin' yer coat-tails...! :D
When you are having anal sex with a girl and you pull out and put it into her vagina.
Friend #1: I was have amazing anal sex with that filthy little filly Stacy and I pulled it out and put it deep in her bum, straight mud-flappin' bro.
Friend #2: Amazing, pure class.