Top Definition
FSMF is an acronym created for the phrase "fuckin shit mother fucker." The phrase is used somewhat as a release of anger or irritation and is often used suddenly without warning when the user is at the point where they just snap.

The acronym is used more casually when the level of anger is relatively low or even non existent.
Ben: Look at Tim over there trying to fix that machine

Josh: He looks like hes having a hard time

Ben: Ya he doesnt really know what hes doing.

Tim: Fuckin shit mother fucker!!!!

--

Josh: Hey dude your shoe is untied.

Ben: fsmf
by bean01 August 05, 2008
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