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A fucking hardcore nutter. Someone you really don't want to mess with. Would probably break a bottle over your noodle, then ask questions later.
'You really don't wanna mess with that guy mate, he's a fucking nutbar'
nutbar by richard piper July 1, 2004
Related Words
To describe someone as being a proper mentalist. Someone who is totally unhinged and delusional
Damn, Dr Hewitt has lost the plot. She's a proper Nutbar.
nutbar by Neil Hick August 11, 2007
The cross bar/ top tube on the frame of male bicycles.
Nut - testicles

Bar- metal rod
Guy1- Look he nutted himself on the nutbar!

Guy2- Shit! Fuck that.

Guy 1- Why are you putting a cup on?!
Guy 2- It's a live show you don't want to nut crunch yourself on the nutbar and have the audience post you on YouTube screaming while holding your nuts.
Nutbar by DaveDH March 10, 2023
an utterly foolish, Silly or senseless person.
If someone says something "silly" you can refer to them as a nutbar.
Nutbar by Wardsha2002 February 24, 2009
When someone is acting really out of character, does something you don't agree with or is in serious danger of looking like a prat, you call them a nutbar.
person:what do you think if I went to the gig in this?
other person:I'd think you were a nutbar it'd get trashed in seconds...

person:I need to be there by 3.30
other person: you nutbar you're going to be late anyway!
nutbar by SkrewyRebirth April 18, 2006
Adjective. Term used to describe when something is stupendously outrageous or of extremely superb quality.
"Dude... that girl's body is nutbar!!"

"Yo momma looks nutbar in that Cheetah skin miniskirt"

"Man, that new Lexus IS is nutbar!"
nutbar by Myko Wang November 8, 2005