DUMF is the one syllable word meaning dumb-fuck or dumfuck
Ellen forgot to turn off her headlights, what a DUMF
by JEBalke January 8, 2008
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Designated Unatractive Male Friend of a Woman whohangs around her all day (but is NEVER her husband or boyfriend) usualy also a GBF
I saw thsis hot chick but she was this ugly ass man with no teeth and was a fat as a van he was sucha DUMF
by Trixilater August 2, 2015
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