An FCC-friendly way of saying "unable to be fucked with". Coined on the Cartoon Network Adult Swim message boards, later displayed on a bumper between episodes of Family Guy and Futurama to millions of American viewers.
by m4wk August 13, 2004
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
You locked yourself out of your car! SMF!!!111one111
by m4wk July 16, 2004