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if you have a fat neck, it means you are proud, showing off, or bragging non-verbally. This term was coined when a friend of ours would get arrogant in a debate and tuck his chin in thus fattening his neck.
How fat is your neck over the new job?

Do you need the doors widened to fit your fat neck through?

Is that new dress you bought a total neckk thickener?

My neck is so fat over kissing Vince Neil.
fat neck by Horns a plenty June 12, 2010
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somebody with a rather large neck,
somewhat of a dick cheese
oi fuck! look at driver wat a fat neck
fat neck by B August 4, 2003
To slap someone very hard on an exposed neck usually due to a shit call and/or just for fun, or just to annoy them.
Fredrick: “hey T-Series is actually a really good YouTube channel”

Morgan: “that deserves a fat neck”
Fat Neck by Anime titties01 August 27, 2019
A man, overweight with a bigger than normal neck. Sign of a dumbass
You see that guy there, that Dan Ferry, what a fat neck.
Fat Neck by Al Lazzerman December 10, 2003
Either a man that sells you pot, or the act of strangling a bitch.
If that bitch isn't there, I'm going to Fat Neck her.
Fat Neck by Monkey December 5, 2004
In New York a Fat Neck Is An Illegal Alien, Mexican, South & Central American.
Them fat necks have no papers.

I hate how that fat neck drives.
Fat Neck by windycitybluez September 7, 2010
somebody that has low mental capacity due to smoking too much weed
"oi FUCK, harvey you are the dumbest FAT NECK cunty lips i have ever seen, fork out for $5 of fuel you cash leg white neck"
fat neck by Nizzla September 4, 2003