stands for Supreme Master First Class. A rank used in Counter-Strike: Global Offensive game.
Eddie: Hey man congrats on smfc!
Me: Thanks dude.
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Sphagetti Monster Fucking Carbonera
Carbonera is a delicious bacon-based pasta sauce. This phrase is used where one might otherwise encounter JFC, or "Jesus Fucking Christ", if one were more traditionally inclined.
SMFC, that's the stupidest thing I've ever heard
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Acronym and text slang. "Shaking my fat cock". Similar to SMH (shaking my head) except SMFC is reserved for those who posses a massive hog.
You don't wear monster condoms for your magnum dong? smfc...