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The term fucknaut, though similar in sound and meaning to the word fucknut, can be thought of in the same terms as the word astronaut. That is, an astronaut is one who traverses the astros and the suffix -naut itself means voyager, so a fucknaut can be thought of as one who explores the fucks, meaning one who engages in trivial and ridiculous matters, which in turn makes that person foolish, not unlike a fuckNUT. Therefore, the terms fucknaut and fucknut can be used synonymously, but the -NAUT portion should be clearly emphasized.
Tom is such a god damn fucknaut. He insisted that there was a blowout sale at the Big Lots two towns over, despite my telling him that there was not, so he drove 3 hours only to arrive at a Big Lots that has been closed down for months and was reconverted to a Fashion Bug. What a FUCKNAUT!
Fucknaut by Moe Sr. April 3, 2012
n. Derived from Greek meaning, "a fucking dickwad." Used in reference to cockjockies, asscrabs, bitches, and assbuckets, to name but a few.
That Johny is a fucknaut, he insulted my girlfriend then vomited in my car.
fucknaut by The Penguin Incarnate October 15, 2003

Cranberry Fucknut 

Probably the best insult to use. Ever. Use it instead of dipshit, or even ass hat.
Man, you can be a real cranberry fucknut sometimes.
1. A person who is so annoying and dumb that they can no longer be classed as an idiot and therefore a new level of idiot was created for them, the Fucknut.
2. A person who as shit for brains (that's if they lucky).
3. A person who was dropped from a tall building at birth.
4. Also see: Alex Glumac
"Fucking fucknut."
"Don't eat from the bin, YOU FUCKNUT."
Fucknut by PotatoChip May 4, 2003

fucknutt 

This word is to describe a person who is a stupid son of a bitch or who makes a complete ass of themselves on a regular basis.
Who was the fucknutt that just ran in to that glass door.
fucknutt by Shimatta October 27, 2004

fucknutsville 

Rahm Emanuel's description of Washington, DC; in particular, its political culture.
It's already hard enough having to deal with goddamn politicians all day. Add to that the internet, blogs, and the 24-hour news cycle and it's just fucknutsville.
fucknutsville by captainwerd August 9, 2010