2 definition 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

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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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