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The definitive way to tell some one to "Shut their mouth"
"Neck up"........... CUNT.
"Neck up",,,,,did i ask for your fucking opinion.
"Neck up",,,,FUCKHEAD.
If in Australia, and someone is hanging around and you can't get a word in,you can say "Neck up you Blowfly',cunt likes the sound of his own voice.
NECK UP by GS71 April 4, 2015

neckaphobia

One whoms fear of being slapped on the neck when others feel its necessary. Also referred to as a "neck". Examples necessary times to neck include but are not limited to.. Birthday necks, Stupidity necks, Surprise necks ect.
"that dumbass that gave me neckaphobia"
neckaphobia by Em-Has-neckaphobia February 7, 2017
the myspace/facebook pictures posted by an ashamed fat girl.
dude 1: damn check this super hot chic out bra!

dude 2: well bra, those are all neckups, she's probably got an ass full of mashed patatoes and cottage cheese thighs...

dude 1: i bet she likes diet pepsi.
neckups by steve's dog October 25, 2009

dead from the neck up 

some one how is so dumb that stupid no longer can describe them accurately
Jimmy : dude that chick is dead from the neck up

Checkup from the neck up 

Suggesting this is a way of saying someone is talking or acting crazy. Used to express disbelief, skepticism, or simple mocking. Indicates a level of ridicule serious enough to move the subject away from what the other person has said, and onto the state of mind of the speaker.
"If you think you can get away with driving 50 more miles with the 'Empty' light on, you need a checkup from the neck up."

Neck-Up Girl 

A girl with no pictures of her that expose much/anything below the neckline--the insinuation being the presence of weight or general body-image issues. The term can be altered for a male of the same nature.
A: Hey, how come this girl doesn't have any pictures of her whole body? All her pictures are just different angles on her face.

B: That one girl Tommy just started dating? Yeah, she's a neck-up girl.

A: Aw, man. Good luck, Tommy.
Neck-Up Girl by Defnot January 14, 2011