someone who is considered a pest with less than average intellect. someone oblivious to the fact that nobody wants them around because he's a buster. ie., tells nonsensical jokes, butts into conversations, tries to "one up" everyone, blurts out random facts that have nothing to do with the present topic, etc.
"Look, that buster Joel just walked through the door!"
a reply could be:
"Who the hell invited that fucknut to the party?! Come on, let's hide!"
by Robert Fagardo December 12, 2004
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Backstage slang: The small square-headed nut on the side of a C-clamp used to hang a light from a bar. Secures the light so it won't swing side to side. So called because they are easy to over-tighten, snapping the nut and making the clamp useless.
Stagehand: Fuck! I busted the fucking fucknut!

Lead Electrician: *sigh* get a new clamp from storage and swap it out... fast.
by We'll sleep when we're dead. December 28, 2005
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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.
by Chad Collins December 27, 2003
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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 8, 2003
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Some one so annoying that they dont leave you alone, like those fucknuts on msn messenger.
by Jamie Wright February 21, 2004
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Term of abuse coined by Chris Morris as the character Ted Maul in the 'Animals' episode of Brass Eye.
Local press caught whiff of a weird one when the vandal shot his paint straight at the cow in the form of words like "twat", and later "fucknut" and "arsecandle"...
by Montesquieu March 13, 2004
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a person you'd just as soon be rid of
"You are a major fucknut."
by kitznegari November 9, 2002
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