1 definition by TheParrott

Top Definition
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
Free Daily Email

Type your email address below to get our free Urban Word of the Day every morning!

Emails are sent from daily@urbandictionary.com. We'll never spam you.