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22.
Acronym for: Stop fucking around

Used in dire situations where it seems as if people are not doing anything productive and are just "fucking around."

"What the hell is John doing? SFA JOHN! SFA!"
by Scotty McGee May 04, 2008
 
23.
SFA
Sweet Fucking All
Diet Pepsi has sfa sugar.
by Tom November 22, 2003
 
24.
SFA
sweet fuck all. Amounting to nothing or very little
Wow what a waste, i did SFA this weekend.
by Dan July 24, 2004