Top Definition
A term used to insult someone, alternative to other other words (asshole, dick, etc.) but much funner and more fast-food friendly to say
"Why did you poop in my towels, you fucknug?"
by Sexiest Camel Alive October 09, 2009
Short for fuck nugget

An idiot, somebody who is incredibly annoying.
"He is such a fuck nug!"
by IceWarm February 06, 2004

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