A Menc is a person who has lost touch with reality in some way; who embodies self-delusion as their illness of choice and who affects you to the point of incredulity, regarding their detachment from what is obvious to everyone else.

Politically incorrect to associate with disabled people; rather being reserved for merchants who hide their malingering ways behind a diagnosis of mental illness and who drain people they come into contact with, with their predictable antics.
Specifically, somebody who expects you to believe their serial blags, such as "Sorry I missed my appointment today, dodgy curry last night" to which one's automatic internal response is "tiresome Menc".
by The Cauteriser October 31, 2010
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Menc is a term used to directly define a person who has a mental disability such as downs syndrome or is mentally inept in some way. It can be used in a jovial sense, for example toward a perfectly normal person who is acting strangely, carelessly or just fooling around. Possible origins of the word Menc include Mencap, the UK based charity which promotes Mencs in an attempt to integrate them into society, whether we like it or not.
Tim, why can't you follow a simple instruction? You're such a menc.
by bluefish1 October 22, 2008
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Short form or slang for 'Mental'
'This black blade right here is mence, it's not just drink that will damage your liver ' - Box12
by Y.BrixtonFrog March 10, 2018
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a retarded kid who teaches you life lessons by example.
normal guy (before): it seems like all my life i was defending mences...

interaction with mences.

normal guy (after): maybe, just maybe. mences was defending me.
by big tav March 9, 2007
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This is slang for amence. This word can be used in most sentences. It can also be used to explain how high, drunk or fucked you are.
Yo dude, I’m absolutely menced mate!”

“I just slept with my best friends girl, I’m menced man.”
“This party is mence mate!”
by DrunkDaddyBoy May 13, 2019
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Jayden
He's a beautiful guy, his eyes are shiny, his hair is soft.
hes not exactly mean nor nice, he's the kind of guy you want around ig
all I gotta say is, I love you
(Jayden Mence) Jayden's smile could light up NYC
by h_aileejayde...Jayden<3 March 15, 2022
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An asshole named Alana who is supper menacing and will not be stopped
Girl 1: I really love Alana 😍😍
Girl 2:carful she’s a mence 😪😪
Norah: bitch be scared.
by Slayestofslays May 10, 2022
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