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Fucknaut is quite simply a term used to describe someone that is ‘way out there’ and ‘fucking oneself’. Basically, anyone that has done something obviously stupid, yet unpredictable.
Which one of you fucknauts left the beer sitting on the router?
fucknaut by CygonX September 1, 2004
Related Words

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
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

fucknaught 

n. One who is essentially less than a dumbass, retard, idiot, moron, or any other term of the like due to either excessive ignorance, stupidity, or both.
"That guy's a fucknaught. He can't even do his own job." or "Did you see that fucknaught who almost hit me? He couldn't drive if his life depended on it."
fucknaught by JungKiTae June 13, 2007

fucknart 

Oh come on Johnny how did you fucking fuck that up so fucking hard you fucking fucknart
1. An insult containing the word "fuck" inspired by the 80's band The Communards.

2. An alternative name for Oxnard, California.
The Communards are fucknards.

I live in Fucknard, California.
Fucknard by _Steve January 7, 2010