S M F otherwise known as Sergio Mora Fan, but to me it means Smart, Motivated, Funny. He is a man that is extremely loyal, and is know in many boxing forums, to defend the Latin Snake to the very end. Even when fans of Peter Manfredo Jr get vulgar, and make personal attacks on him, he just lets it roll off his back. He is a man that is very selective in who he befriends, but once he does, he is the best friend you could ever want. He is giving, big-hearted, helpful, kind, creative, humorous, and so much more. He is, the best part of my heart.
I believe in fate, and just when I needed it, God brought S M F into my life.
by 1crazyfan February 26, 2006

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Top Definition
SMF
An abbreviation for "so much fun".

The antonym of FML.
Man: Where were you last night.

Man 2: I was at a karaoke bar. SMF.
by somuchf.com May 13, 2009

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smf
stupid mother fucker
Did you just fuck that bitch with blue waffles? SMF!
by goliath92738 April 03, 2011

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smf
Abbreviation for Sick Mother Fucker
Sarah: I just drank ten Snapple teas!!!!
Leah: you smf!!!!!!!!

*Vulcan sign*
by penemaestro73 July 03, 2013

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smf
"shaking my fist"

an acronym to let someone know that you are shaking your fist in joking anger. This can be thought of as going along with the phrase "why, I oughta...."
give me back my damn ps3, you've "borrowed" it for 5 months. smf
by j. yee January 17, 2011

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Save My Fucking Seat.
What you say to your "friends" when you get up at a party to go get some more beer.
Asshole #1: "Go fill my keg cup."
Asshole #2: "SMFS"
by Treighz November 28, 2007

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really means STUPID MUHH FHUCKKA

when a person is gettin on your nerves and the say something stupid ass fhuckk. you scream S.M.F
Parent: Girl u *this* close away from gettin yo ass smaked

Daughter: Butt moms u got a big ass bump on your forehead.

Parent: Bitch I kno tht! U say some dumb ass shidd S.M.F!!
by TiyyBruhh😂💯 January 07, 2015

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SMF
Acronym for "Shake My Fist"

When something is so ludicrous that a simple shake of the head will not suffice. Geared towards actions that incite slight anger and/or annoyance.
GIRL 1: "Say whaaaaaaat? Did you hear that Arnold banged his maid, fathered her child the same week he had his own with Maria, AND took her along on family vacations? Shouldn't he just go DIAF?"

GIRL2: "Agreed. ROARRRR, SMF!!!!"
by guanva May 24, 2011

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