Rip your head off and shit down your neck 

As can be gathered from the expression, it indicates a state of intense anger and annoyance, so much so that the person making the threat is ready, willing and able to inflict physical pain and degradation upon the person who has annoyed them. While it may not literally result in the removal of the offenders head and defecating into the stump, it will usually result in physical violence and a humbling of the person who caused the offence.
The expression that is believed to have originated with the British Royal Navy. It gradually became used within all branches of the armed forces and later spread to the civilian organisations associated with them before obtaining wider usage.

"Malcolm if you don't fuck off I'm going to rip your head off and shit down your neck!"

Rip your head off and shit down your neck by AKACroatalin March 19, 2015

breathing down your neck 

someone annoying you to complete a task

When you're an hour away from the deadline for that spreadsheet of "value-adding actionable items" and your boss is breathing down your neck

breathing down your neck by Rapture1 October 12, 2010

I'll rip your head off and shit down your neck

A person, or entity, seperates your head from your body and thereafter takes a dumb that glides down your neck.

From the Duke Nukem game, said by Duke Nukem (ingame character).

I'll rip your head off and shit down your neck!

I'll rip your head off and shit down your neck by Nicolai Thomsen January 25, 2009

The Thing With Teeth Halfway Down Its Neck 

A monster in almost-human form that dates clinically-obese security guards. Also known as Girlfriend of the Porky Scotcher, this vile creature is so horrifically ugly that those who look at it have been known to retch with such violence they vomit their livers out onto the ugly bitch's shoes.

Oh shit, its The Thing!

What?! You don't mean The Thing With Teeth Halfway Down Its Neck?

Yes! Nogtard vomited his liver on the bitch's shoes last week.

I know. The Porky Scotcher picked up the liver and barbecued it.

The Thing With Teeth Halfway Down Its Neck by Benny Twadge May 24, 2009

nice from the neck down 

another way of saying butterface, referring to someone who is 8/9ths perfect, but the uppermost 1/9th is a killer. one can say "nnd" for short.

you see her standing on line, waiting to check out. expensive high-heel FMs, tan hose, long slender legs, perfect heart-shaped butt, gently curving hips, slim waist, large firm breasts, elegant neck. the ideal woman.........and then she turns toward you........and has a face like the dark side of the moon. oh well, they all look the same with the lights out. this is the essence of nice from the neck down.

nice from the neck down by earpuller December 28, 2005

Well chop off my head, and shit down my neck! 

An indication of genuine, but not extreme, shock or surprise. Best said in a Southern accent.

More savvy users can infuse the phrase with sarcastic meaning, as a variant of "Duh!"

Well chop off my head, and shit down my neck!

Well chop off my head, and shit down my neck! by mbryo_ January 24, 2011

neck down device 

a females boy toy that is there to perform not to think. One that never argues when given a command by a female his only response is Oh K.

Girl says:" Hey you can you fill up my drink and while you're there clean up the kitchen and make sure I'm satisfied in how the job is done"

Neck down device says: Oh K

neck down device by Quimmy650 August 22, 2009