SFD
Social Filter Deficiency

A syndrome in which the said subject has trouble deciphering which thoughts to express aloud, and which to keep silent.

Often the source of embarrassment of subject's companions.
One:
Kyle - Chad has SFD.
Bailey - You reckon so?
Kyle - Yes, he just asked me if I would graffiti the school's walls with him while we were eating thanksgiving dinner at my grandma's house!
Bailey - Yeah... he does have difficulty gauging what to and not to say.

Two:
Chad - (rather loudly) GUYS I'M SO DRUNK!!!
Krystan - Chad! Stop being to SFD! I'm on the phone with my mother!!

Three:
Chad - I really need to take a shit.
Teacher - ... SFD...
by kyle thinks of thisngs, I gues August 29, 2008
Top Definition
SFD
A euphemistic text messaging acronymn that generally stands for 'Shit Fuck Damn'. SFD is often followed by an exclamation point for emphasis. The term is commonly used to express annoyance, frustration, or anger.

It is acceptable for SFD to be used spontaneously in courtship by a suitor expressing his/her approval of a desired lover's physical prowess.
Text messaging conversation...

Jim: Touchdown South Carolina.
Caroline: Shit. Fuck. Damn.
Jim: The preferred term is SFD.

Moments later...

Jim: They just scored again.
Caroline: SFD!!!

Or

Ronald: Yo Benj, here comes that shawty...
<shawty walks by>
Benji: SFD!!!!!!!!!!!!!!
by JimSweetFeet October 10, 2010
SFD
SFD is an abbreviation for "So Fucking Done."

It can be used when your friend makes a moronic comment and their best luck is to just stop where they are at.
Erin: "I make make illegitimate symbols too. Look. <#%. A waffle cone."

Hottie: SFD.

Erin: "Simon folows dinosaurs."

Hottie: SFD, Again.
by Gays Under Wood. October 11, 2011
SFD
An acronym that refers to the combo any self-respecting sub-shop has on their menu - a sub, an order of fries, and a soda. Or, "Sub Fry Drink". Or, SFD.
I've got a hunger only a SFD can satisfy.
by thashaq November 07, 2009
SFD
Straight Fucking Down, or Straight the Fuck Down
Ski buddy 1: Hey man, which way are you going to ski this couloir?
Ski buddy 2: SFD!!!
Ski buddy 1:Gnar, dude.
by fwankie May 26, 2015
SFD
An acronym that is secretly used for So Fucking Done.
There's no reason anymore. I'm SFD!
by Undine July 27, 2013
SFD
Sexual Frustration Depression

The mix of sexual frustration and being depressed about not getting it that night
I have a bad case of SFD, I wish I could go out but I have date night with netflix and my dildo
by spunkyy January 25, 2014
SFD
Slut For Doritos
Janice is such a SFD. I mean she's cramming those things in her mouth like her life depends on it!
by JaCrispy423 June 01, 2016
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