the tit's nut sack 

The very very best

Heavily disputed debates have concluded that Rolls-Royce is indeed the tit's nut sack of the automobile industry.

the tit's nut sack by dr fjord October 17, 2013

busier than stink on a bum's nut sack 

By definition, an extremely popular and busy form of private enterprise.

Mohr: Hey Chris, do you want to grab some smoked meat at Schwartz's?

Walken: Let me tell you pal, you'll never get a table in there tonight. That place is busier than stink on a bum's nut sack!

busier than stink on a bum's nut sack by Skeletor's Havoc Staff August 1, 2013

Mikey's Nut Fuck Sundae

The act of a woman laying on her back/shoulders against a bed with her pussy pointing to the ceiling, legs back towards her then the guy grabbing his nuts and inserting them into her pussy.
Depending on the bed and the lady, this may require her to lay on a low stool to ensure her pussy is at the right height
the stool can be used by the guy to hover over her pussy and lower himself.
It's the nicest feeling, (have to be hairless to appreciate it.)

After fisting my subslut, I gave her Mikey's Nut Fuck Sundae, the right nut was slightly painful, but the left nut, slipped in and popped out with ease.

Mikey's Nut Fuck Sundae by phred512 November 14, 2017

Roofer's Nut 

When you're a roofer and your're done for the day...All of the sweat, stench, dirt and grime rotting on your ball bag festers to become roofers nut.

Oh baby, when you come home don't shower off your roofer's nut. I wanna get all the juices.

Roofer's Nut by boofaholic March 15, 2015

Deadman’s Nut

The act of a man edging for a 90 day period in order to release a nut so incredibly large it could lead to dehydration, seizures, cardiac arrest, or even death. The production is so vast and volatile that others within the “splash zone “ are often left with lasting mental and physical trauma. Although warned of the possible horrors, many men still attempt the “Vikings Deed” to this very day. Legend has it that every US president is the direct product of insemination via a Deadman’s Nut.

I heard Big Jon is the 75th day of the Deadman’s Nut, I hope Cait gets her Frog Toggs in time

Deadman’s Nut by StatDaddy April 21, 2020

Going off it's nut 

Something or someone that is going crazy or mental or pyscho or insane.

Stevo: my vista computer is Going off it's nut!

Going off it's nut by Mysta D February 9, 2009

snut 

When someone does not know what is going on, but wants to look or feel smart.

This exam is so snut.
That boy is such a snut.

snut by Innocent Devil December 28, 2005