2 definitions by m4wk

Top Definition
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.
Man, don't mess with that kid. He's unfukwitable.
by m4wk August 12, 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
by m4wk July 16, 2004
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