look up any word, like donkey punch:
 
3.
To tell a person to commit suicide by means of hanging.
"Why don't you do yourself a favour and neck up you cunt? Your a Parrot! Fucking blowfly.." Keithy Goerge to Chopper
by MarkChopperBrandonReid September 16, 2008
 
1.
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.
by steve's dog October 24, 2009
 
2.
Neck up means to ask someone to stop speaking un-truths. And it also is a non polite way to persuade a person or individuals to cease their conversation, or to "shut up".
Hodgo: "Union players are all gay champ, bogans are fairdinkum tops"
Jango Fett: "Neck up cocksmoke/belter!"
by Mooloomen August 04, 2006
 
4.
The act of forcing ones premature departure from a non relevant discussion, whilst holding your thumb perpendicular to your neck and index finger directly toward the sky.
In the words of Chopper "Neck up, parrot"
by drew christx May 30, 2005
 
5.
the process of downing a beer
Dave: your shit.
John: neck up you clown!
by Morrissey February 19, 2006
 
6.
inserting head up anus till neck is up the anal cavity
neck up you fuckhead
by nawlasn October 13, 2003