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3.
A jack off. Or, ejaculation caused by masturbation.
"Quit being a knuckle nut and come help us". Or, "I had a knuckle nut in the shower this morning".
by TheParrott May 18, 2010
 
1.
A trademark for an outrageously cool titanium ring
I'm getting me one of those KNUCKLENUTS rings!
by Ti Nuts September 28, 2006
 
2.
A trademark for an outrageously cool titanium ring! Go to knucklenuts.com.
I'm getting me one of those KNUCKLENUTS rings!
by Ti Nuts September 27, 2006
 
4.
getting hit in the balls
Trever asked Bob to hit him in the balls for pleasure.
by Matt August 28, 2003
 
5.
a fucking loser
Andrew Batley is a knucklenuts
by Marc Gimbel February 16, 2004