Someone who's actions are unpredictable and hazardous.
Danny: he said he loved me and now he's fucking some other guy
Jacq: Don't worry about him, you know he's a fucknut
by DannyS2 March 13, 2008
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(1) A disparaging term for a person below average intellgence; (2) a nut that has been fucked . . . very hard.
Jesus Christ, that asshole is a fucknut!

Did you see his fucknut? It was WAY bigger than the other!
by Anonymous December 3, 2002
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Like a fuckknuckle only more irritating. You may forgive a fuckknuckle but are more likely to slap someone who is fucknuts.
Listen fucknuts you ran the stop sign and ran into me. That means you're the asshole not me.
by catmannz July 16, 2005
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a young adult male who is clueless about most everything, yet clueless about everything
listen fucknut, pay attention to how i do this and maybe you will learn something
by DougieEinstein August 21, 2015
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When a man, while boning a girl, pushes it in so far that one, or both of their balls get stuck in the girl's vagina.
Haha. Look at that guy, he's got to wear a ball brace for his fucknut.
by ifukdyermom February 20, 2009
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an annoying, stupid asshole who thinks more of himself than anyone would ever think.
David Sch... is a fucknut!
by anonymous1anonymous2 January 17, 2009
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