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. 
Yer is a girl you see around. u can't but not noticed her much. since she is so small. the look of her just makes you smile because of how cute she is. not many girls have the name "Yer" but it does and is a unique name. she type 2 hold things in. she's the type to act as if she does not do those things that she says to others but does.
by lola q. November 19, 2020
Get the Yermug. Refers to a brief period where an aged-brained person absent-mindedly allows his clothing to slip down or gap open, temporarily showing one or more of his privates.
I changed from my shorts into my pants at da bus-stop, forgetting dat I'd neglected to put on any undies beforehand --- definitely a "seen yer" moment!
by QuacksO October 6, 2024
Get the "seen yer" momentmug. by fatfonze September 5, 2025
Get the Hows yer gardenmug. by KING3R23 January 27, 2020
Get the yer mommug. by Kyle03Str March 25, 2019
Get the Suck Yer Mummug.