You're doing WHAT and texting? STFD!
by MagneticPortal June 19, 2014
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Sit the Fuck Down

Used when someone just says something obnoxious and you need to put them in their place
Keenan: Aww man, my parents aren't getting me a Mustang for my 16th birthday. This is so unfair.

Damien: Dude, STFD. stop being a douche.
by Dontbeadick May 25, 2011
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Sit The F*ck Down, a taunt used in Weight Watchers Fitbit or other fitness device challenges. The person using this expression would prefer the other challenger(s) to stop increasing their step count or calories burn.
I've just been overtaken! You need to STFD because I need to win!
by 'Duke' February 06, 2015
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Shut-The-Fuck-Down.
Changed version of STFU which means Shut The Fuck Up.
Joe: Your stupid.
Jim: STFU
Joe: STFD!
by Claude Alsept June 06, 2005
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