SMF 

Shaking my forehead. A variation of SMH (Shaking My Head). Especially relevant to those who have big foreheads.

A- Sorry I can't hang out tonight I'm watching TV.

B- SMF, you always do this'

SMF by E017 October 22, 2016

smf 

Slapping my forehead

Crap. I forgot to bring my books. Smf!

smf by ThatAtheistWithA53/4Inch December 20, 2010

smf 

Acronym for stupid mother fucker, often used in conjunction with l33tsp34|<, or more commonly, simply as a friendly expression used during internet chat or to spam message boards

My roomate just walked in and puked on his bed. What a smf.

You locked yourself out of your car! SMF!!!111one111

smf by m4wk July 16, 2004

SMF 

acronym for "shank my face" or "shank me in the face". commonly used to express disappointment.

person 1: "dude i just found out we have a math test today.."
person 2: "ugh SMF"

person 1: "ew here comes Vickie.."
person 2: "SMF"

SMF by psychologicalromance December 24, 2010

SMF 

a "Sexy Mother Fucker." only the cream of the crop have the honor of becoming an SMF. It is an exclusive organization and membership is based on invite only

The warcry of the SMF: "SMF on three, one...two... three... SMF!!!

SMF by WackoJacko January 25, 2005

SMF 

Sexy Mother Fucker a fine beautiful sexy female who you can't help but lust and crave for.

Sexy Mother Fucker SMF Sexy Beautiful Desirable Fine Lovable

SMF by she.got.me.crushin July 26, 2016

Smf 

Shaking my forehead

Yea Smf is a thing, smf

Smf by Hammy-__- October 25, 2017