to replace your vulgar language with the letters they begin with. as to not sound like an 8 year old who just learned the word.
no way man, f that s.
by adam teabag October 10, 2005
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Tryin to smoke?
F S Y D
by Co Lew February 21, 2008
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Used in certain "Right Leaning" political groups online. Deceptively not an acronym, the meaning literally is to go faster because one wishes to accelerate to the inevitable "Collapse". After which comes the rebuilding of the traditional structures of society (but with technology and spirituality/magic perfectly integrated).

Then to call anything F/A/S/T means it has any of these concept implicit in it. I.e. a picture of a knight/samurai but holding a machine gun. Or really anything with an archeofuturist aesthetic.
Bruh did you read the manifesto of the recent school shooter? It was F/A/S/T as F*ck!
by Captainwillies December 17, 2019
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A shorthand salutation used usually to end emails written by United States Marines. Stands for Semper Fidelis (Always Faithful) the USMC motto.
Jones,

Thanks for helpin us out back here. I'll make sure Gunny knows who came through for us.

S/f, Baker
by effshews March 17, 2014
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Sucking and F*cking.
I was doin' a little S&F last night with my boyfriend, man my @ss hurts!
by masteriwi April 24, 2011
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Suck & Fuck - used to describe a hot session of sex
by Mike in Vancouver August 10, 2006
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