1. as a question it can be used to question someones stupid statement.
2.A way to tell someone they are not intellegent.
1. man1: My house flies into space at night.
Me:Are you fucking dumb?

2.Man1:Should we go to Canada tonight?
Me:no don't be fucking dumb, you must be the epitome of dumbassery
by mike1117 February 2, 2010
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that porn star used to be smart, but she got fucked dumb.
by stinksTheCat February 14, 2011
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it means you are stupid, but not just a little stupid. If someone calls you that, they mean that they are mentally ill and need to seek help.

It's a pretty good word to use if you like it.
Jasmin: Hello how to dance wap
Novali: What is that
Jasmin: Ur fucking dumb fuck
by November 6, 2020
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Billy Bob: Hey, hold my beer while I prove these shoes are fireproof.
Nick: Fuck The Dumb Shit.
by Claude Ballz June 11, 2004
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A person who knows what you mean when you say something but acts confused.
Jonny: I have food on my table and a roof over my head. I am blessed.
Stevens: What kind of a house doesn't have a roof?
Jonny: It's a saying you dumb fuck!
by Vam Pire 101 August 17, 2017
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1. Someone who gets easily confused and fails to use common sense when neccessary.

2. Someone who is so fucking stupid you want to meet their parents so you can pour hot coffee on their face.
Woman: I'm kind of hungry.
Man: Ok, let's grab a movie.
Womam: Seriously you dumb fuck, I said I'm hungry.
by mmhmm2121 December 15, 2010
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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 24, 2011
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