knocking out 

To go to sleep.

Hey dude I'm tired as hell, I'm knocking out.

knocking out by Gerry4292 April 7, 2011

knocking out the donkey

to fuck a girl in the ass, and right as you're about to cum, you punch her in the back of the head so she tenses up.

The best orgasm I ever had was knocking out the donkey.

knocking out the donkey by Deez Nutz May 30, 2004

Knocking out a skeleton 

When you have been locked down for so long you have literally turned your dick into a skeleton, have no feeling left, and cannot complete the task, due to the lack of sex from too much wanking

I wish this Lockdown would finish

Why is that?

I've started knocking out a skeleton

Dude that's bad, you can't even try the stranger in that situation!

Knocking out a skeleton by Nesda February 12, 2021

Knocking out a chavvy

A woman having a baby.

I can't believe she's 'knocking out a chavvy', she's already got enough kids to make up a football team!

Knocking out a chavvy by Kebab42 June 3, 2023

Knocking one out 

A northern slang term for masturbation. To play with oneself, or toss oneself off.

"I'd love to come with you, but I'm in the middle of knocking one out"

Knocking one out by RichieLeBon March 22, 2012

Knocking it out 

having a quicky, like f*cking in the bathroom

My roommate walked in as we were knocking it out in the kitchen.

Knocking it out by John Deere June 8, 2004

Knocking a grant out 

Code for stimulate one's genitals with one's hand for sexual pleasure

I'm going knocking a grant out

Knocking a grant out by S13rev February 5, 2023