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Litterally means "suck my dick mother fucker", Most commonly used in chat rooms, text messages, or IM.
Gamer1: Stop killing me!

gamer2: SMDMF!!!!!!!!!!
smdmf by Uncle Jordan January 17, 2009
Related Words
smdmf sdmf smdf sgdmf Sldmf smdfm smdm Smdmfb smdmm smdof
SDMF is a the creation of Black Label Society--a band led by Ozzy Ozborne's guitarist Zakk Wylde. SDMF is a unique hybrid of shared ideals and fan club. The actual acronym is most commonly read out as either "Society Dwelling Mother Fucker" or "Strength Determination Merciless Forever"
I am a SDMF, and do not wear pink polo shirts with the collars up.
sdmf by Yoder March 30, 2005
Stands for:

STRENGTH DETERMINATION MERCILESS FOREVER

Used by american soldiers during WWII.
i guess you could see SDMF written on helmets, patches or tanks,etc during WWII.

¨Krauts in the open! C´mon guys SDMF with those nazi bastards!¨
sdmf by _goatboy_ April 10, 2006
When heads roll, the more the better: SDMF.
SDMF by Matt Stairs April 23, 2008
1) strength determination merciless forever, the credo of American metal band Black Label Socitey
2) Society dwelling mother fucker ( a BLS fan)
dude:do you like BLS
Dude 2: YEAH SDMF man SDMF
SDMF by mikec589 May 4, 2008
An acronym for the phrase "Suck this dick, motherfucker."
"Clean your room."
"STDMF."
stdmf by nancadelic March 29, 2010