One who is an idiot, or a dumbass, or a shit-for-brains.
Damn dude, don't be suck a fucknut.
by Dick Smack January 08, 2003

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Originally coined by Vince Park. This term is primarily used as an insult towards anyone that acts hardcore on the internet, yet actually has a simple personality offline.
Terry: Dude, what a fuck nut.
Gary: Yeah, I know. Just 'cause he can hack doesn't mean anything. He's still a sheep.
by Thousand Eyes April 20, 2010

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retard,spaz,geek,pencel-head,
dork witch,
do you know what your talking about ya fuck-nut?
by pickel z dunk July 20, 2003

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Expressing anger toward someone, generally for
some sort of retarded behaviour.
'I can't believe that fuck-nut smoked all your weed'
by Mitchell Eagleman May 20, 2008

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Some one so annoying that they dont leave you alone, like those fucknuts on msn messenger.
Robert Baker
by Jamie Wright February 21, 2004

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One who is a fuck nut
Ally: Hey you fuck nut get out from underneath my booty!

David: What's a fuck nut?

Ally: It's just a fuck nut...
by Ally&David September 29, 2011

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Someone who is stupid and thinks they are better than everyone else.

Someone who drives green mustangs and thinks they are hard asses.
Tommy Gilliam is a Fuck Nut.
by ChokeSermon July 09, 2009

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