knuckle nut 

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".

knuckle nut by TheParrott May 19, 2010

nut knuckle 

n. slang 1. When a man pulls his ball sack and one nut out of his unzipped pants, making sure to sqeeze the skin behind the nut to it's bulbous glory. Said nut knuckle is usually pulled out to an unsuspecting participation as a humiliating joke.

Hey mike look at my finger I think i cut it. *pulls out the nut knuckle as mike turns to look*

*mike sees the knuckle and is in stuper*

Fuck off you nut knuckler!

nut knuckle by Necremis December 16, 2005

knuckle nuts 

getting hit in the balls

Trever asked Bob to hit him in the balls for pleasure.

knuckle nuts by Matt August 28, 2003

Nut Knuckles 

When a man masturbates and ejaculates and the sperm (a.k.a. nut) runs down your knuckles of the hand of which he was mastubating with.

Joe: Hey man did you fuck kelly last night?
Drew: Nah, bro she said she didn't want to at the last minute.
Joe: Damn that sucks. So what did you do then?
Drew: Well since she gave me blue balls I had to masturbate to relieve stress, and I accidentally gave myself Nut Knuckles.
Josh: You didn't have to tell me that.
Drew: Hey man you asked.

Nut Knuckles by Negros Love Maple Syrup October 4, 2016

knucklenuts

A trademark for an outrageously cool titanium ring

I'm getting me one of those KNUCKLENUTS rings!

knucklenuts by Ti Nuts September 28, 2006

knucklenuts

A trademark for an outrageously cool titanium ring! Go to knucklenuts.com.

I'm getting me one of those KNUCKLENUTS rings!

knucklenuts by Ti Nuts September 21, 2008

Knucklebutting

The act of inserting multiple fingers at least second knuckle deep into your partners rectum, optimally by surprise. Often done during fellatio or cunnilingus.

Sabrina is great at knucklebutting, she can get third knuckle deep before you even notice.

Knucklebutting by SasquatchSB October 5, 2010