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1.
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.
door somuchf.com 13 mei 2009
 
2.
smf
stupid mother fucker
Did you just fuck that bitch with blue waffles? SMF!
door goliath92738 3 april 2011
 
3.
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"
door Treighz 28 november 2007
 
4.
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
door j. yee 17 januari 2011
 
5.
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!!!!"
door guanva 24 mei 2011
 
6.
smf
Abbreviation for Sick Mother Fucker
Sarah: I just drank ten Snapple teas!!!!
Leah: you smf!!!!!!!!

*Vulcan sign*
door penemaestro73 3 juli 2013
 
7.
SMF
Soulmate Forever. You find the perfect soulmate and join with them for the rest of your life
I think I met my SMF on the train today.
door Learn What Love Is 11 oktober 2011