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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.
Boy 1: Damn that girl fine .
BOy 2/Dumb Fuck: Naw her grandma fine.
Dumb Fuck by Kristin April 23, 2005
Any person on here that says if u are reading this because that's wut this website is made to do u dumb fuck
Damn that guys a dumb fuck ahahaaa
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
dumb fuck by Arjun Patel October 3, 2007
Paul: Why is this dumb fuck looking at random words on urban dictionary?

Blart: What do you mean dumb fuck? You do the same thing!

Mall cop: Hey could you dumb fucks stop saying dumb fuck? There are kids in this mall!

Paul and Blart: Fine dumb fuck!

Mall cop: Thank you dumb fucks!

Paul and Blart: You're welcome dumb fuck!
Meaning a complete stupid ass, see also cunt "Cant understand normal thinking" also means George W. Bush.
Wow, Our president is a complete dumb fuck!
or
Hey Dumb fuck is giving his state of the union addres..
Dumb Fuck by lordmaji December 29, 2004