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One who is "hyper-stupid." Or one who is more stupid than stupid itself: hence a fucknut.
The girl called the guy, whom she liked, and told him that she hated him, thus the guy, knowing that she did indeed like him, called her a fucknut.
fucknut by Chad Collins December 27, 2003
One who is an idiot, or a dumbass, or a shit-for-brains.
Damn dude, don't be suck a fucknut.
fucknut by Dick Smack January 8, 2003

fucknasty 

(adj.)to be incredibly horribly nasty
-well shes um..fuck nasty

-mayne dat beech is fucknasty
fucknasty by sucka May 16, 2004

Fucknutters 

1. A person who is acting like an fucking idiot
2. Expression of frustration
3. Any Swamp Donkey that thinks that a guy will have sex with them
1. Damn you are a fucknutter tonight man
2. I just got a D on my paper; FUCKNUTTERS!!!
3. Watch out guys the fucknutter are on the loose in the club.
Fucknutters by Mainer November 25, 2007

fucknaught 

n. A dishonorable person who is considered to be below the social existence of trash and/or garbage.
"That fucknaught is a lying, deceitful, disrespectful jerk not worthy of my time."
fucknaught by JungKiTae June 13, 2007

Fucknuttin 

A Fuck who acts like they know shit then has to look it up cos they don't know fucking nothing!
are you fucknuttin me again, you look like you have no idea, why pretend to know
Fucknuttin by Seranos October 11, 2013