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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 Smdmfb sdmf smdf smmfh smdftb SMMFD SMMFGDH smumfy sgdmf
1. "Trumpito aka little hands, can smdftb!! - desus & mero (viceland)"
2. "Last night Melania came over and smdftb!"
smdftb by daturtle9181 March 6, 2017
Acronym that stands for "suck my motherfucking dick".
"You denied my request for a raise, and now you want me to come into work on my day off? SMMFD."
SMMFD by Toby April 2, 2005
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
shakin my god damn motha fuckin head
Babe, we still gettin freaky tonight, right?
no, my bestfriend's cat just died
so?
SO, I have to be sad for her and I can't do that while having sex with you. Geez, you're such a pig! Go sleep on the couch!
smgdmfh!
smgdmfh by Gynerbajinables January 2, 2011
More profane Netspeak variation of smh, meaning "shaking my motherfucking head". An expression of general disdain for an event or statement.
IM conversation:

Userguy1: So... do you shower every day?
Usergirl25: smmfh...
Userguy1: ...
Userguy1: ...what was that for?
Usergirl25: What kind of question was that? Of *course* I shower every day! Don't you?
Userguy1: ...
smmfh by Blackbutterfly February 7, 2007