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Fuckronaut 

1. One who is completely fucked in the head.
2. What you become when you join the bazillion mile high club
Quite frankly, I don't trust either one of you Fuckronauts.
Fuckronaut by Burchie April 28, 2010

fuckernaut 

An unstoppable asshole, (combination of the words Fucker and Juggernaut)
That guy at the bar was a real fuckernaut!
fuckernaut by ReconfigureYou March 22, 2010

Fuckanutta

Just another knotch under the belt! Another fuck with no attachments. Fuck Another BITCH!
Do you think he likes me?

NO! You just a fuckanutta BITCH!
Fuckanutta by ianswerit December 6, 2009
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
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

fuckanator 

A person who has sex with at least 10 people a day
Gabe is a has been a fuckanator ever since he broke up with his girlfriend
fuckanator by TheJeffOnaterSaid September 25, 2019