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
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
by QuacksO March 23, 2019
Get the Juss flappin' yer coat-tailsmug. A decrepit Boomer who can't quite recall what he ate for breakfast but is pretty sure he once had some spicy stories to tell. A former scene-yore.
I'm told that he was quite the ladies man in his time but don't ask him to dance dear, he's a seen-yer.
by nedvacation October 27, 2015
Get the seen-yermug. by Jamie "Skeebz" Manson May 9, 2003
Get the geez yermug. by Kyle03Str March 25, 2019
Get the Suck Yer Mummug.