A dumb fuck is someone who did something incredibly stupid trying to be funny.
The person who put Youngjae from B.A.P as the meaning of 'betrayer' here on Urban Dictionary is a dumb fuck
by himpipi February 15, 2013
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A person who is dumb beyond belief. Not someone named Kate.
by lycheeh8r January 17, 2012
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someone who is so stupid you cant even explain it so you have to use the word dumb fuck to describe them which is even more stupid. this word is only used for those that dont even deserve a real insult.
you are such a dumb fuck.
by guurlsbehindthereddoor July 23, 2011
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A dumb ass person who says stupid shit.
Boy 1: Damn that girl fine .
BOy 2/Dumb Fuck: Naw her grandma fine.
by Kristin April 23, 2005
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1. eric hetzel of chantilly, va
2. george w. bush
3. any one with the intelligence of a cockroach
4. McLovin aka sexy burger

synonyms: blonde, dumb shit, r-tard, bush
eric: *bikes into a car*
arjun: WOW UR THE DEFINITION OF DUMB FUCK!!!
eric: wut?
arjun: no seriously go to urbandictionary.com...becuz ur now the definition for dumb fuck
by Arjun Patel September 20, 2007
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