The Clench Instinct 

When a human dies, their final instinct is to clench their lower orifices. This is why Necrophiliacs claim that corpses are better than the real thing.

Human 1: Dude you see that girl when she was almost stabbed.
Human 2: Yeah, you could see the clench instinct kick in.
Human 1: Yeah dude, it was hot.

Stephen Hawking: My best discovery for science was and will always be, the clench instinct.

The Clench Instinct by erwkjls;lkqy54gb March 18, 2019

Booty Clench Turkey Legs

A sudden clench in a turkeys buttocks down to it's legs. Often used as a joke for memes.

Why was the math book so sad?
Person: I don't know, why?
Booty Clench Turkey Legs
Person: What?

Booty Clench Turkey Legs by Taida.uwu March 15, 2020

Caterpillar Clench 

In other words the vaigina as a grabbing tool.

We went on a date and I got my Johnson caught in her Caterpillar Clench, no complaints

Caterpillar Clench by The Gitfiddl3r May 24, 2021

Superman Clench 

When someone, while riding a dick, clenches their ass so hard that it cuts the blood circulation off.

Oh men, that girl was a 10/10 but she sure got a Superman Clench you know?

Superman Clench by SmileyFarts October 15, 2021

French Clench 

Deadly sex technique, two partners clenching on their private parts as hard as they can, while french kissing, until one of them passes out. May involve urine, ropes, slurry, homeless people, BDSM gear, feces, and rarely : live animals.

- Bob, How's your sex life with Stanley?
- We keep it kinky with the French Clench.

French Clench by totus tuus March 6, 2024

Iron Cock Clench 

An exceedingly firm clench, hold, or grasp around the shaft of the victim's penis, that is so forceful that it is deemed 'iron'. It is painful, and commonly used for, a bargaining piece, a way of releasing anger, an action of aggression, or to see the look on their face.

"I got George in such a good Iron Cock Clench that he almost pooped himself."

Iron Cock Clench by urbandefiner2000 May 7, 2015

Check his clench 

To mentally evaluate mandems ability and determination to squeeze innit

Ayo check his clench, he ain’t really bout it

Check his clench by anonymous November 26, 2021