stfdastfu 

Sit the fuck down and shut the fuck up.

Kyler: Mom keeps spazzing and running around the kitchen.

Josh: Tell her to stfdastfu

stfdastfu by Nehltic February 1, 2009

SDASTFU 

Sit Down and Shut the Fcuk Up

"If you don't have anything meaningful to add to this discussion please SDASTFU..."

SDASTFU by Joseph Ginnah ZN April 6, 2021

SDASTFUFAM 

"Sit Down And Shut The Fuck Up For A Minute"
A group of people, whose purpose is to make the world more chill.

There are only two rules for the group.

1. Shut the fuck up.
2. Sit down.

Breaking any of these rules will result in being kicked out of the group.

"Dude, you need to chill out. Maybe you should join SDASTFUFAM."
"After a few days of being in SDASTFUFAM, I have never felt so peaceful."

SDASTFUFAM by AustinMTrixz11 May 23, 2013

stfuastfd

Means shut the fuck up and sit the fuck down.

Jewish kid: MOMMY A PENNY FELL OUT OF THAT GUYS POCKET!!! LET ME GRAB IT!
Non jewish stepdad: stfuastfd before I whoop your curly headed ass.

stfuastfd by CaptainCaleb December 27, 2010