Mong is short for 'mongoloid', which was originally an anachronistic term for a Down's Syndrome sufferer. The modern Mong however is a total fuckwit, who deserves nothing less than complete humiliation for their idiocy. That includes all those dope smokers too, who relate being 'monged' to being chilled and mellow. Its because when you're stoned you act like a fucking retard, you fucking spazzes!
"You spilt yer pint all over my strides, you FUCKING MONG! I'LL KICK YER FUCKING CUNT IN!"
by Savage Henry August 12, 2004
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Derogatory verb commonly used to describe the state of one's lack of common sense.
by Gavyn August 27, 2004
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another word for spastic or retard some other ways of saying this would be
mongathon monghead ect...
aaron: tom what you doing later?
tom: i dont know yet gunna go watch barbie
aaron: shut up tom you mong
by Waggers January 10, 2009
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The day after a big night out, when the bad bits of those drug you took are still affecting your system
A bunch of guys sitting around a living room:

Brendan: oh my, what is that fabric (looking in the direction of my clothes
horse)

Ian: theyre my sheets,

Followed by uncontrollable laughter from all
by breny January 19, 2005
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A person who is a typical idiot, or a person who can't do so merging simple
Mike: 'mum can you pass me the knife'
Mum: ''here you go'
Mike: 'mum that's a fork you mong'
by Tesco Value February 25, 2017
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See mongoloid. Can also be applied to the state people get into after heavy amounts of intoxicating substances.
You are a stupid fucking mong.
I am completely fucked, I'm such a mong.
by Bob February 5, 2003
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The feeling of uselessness that comes from doing pills (MDMA) and smoking weed.
After tugging on the bong I was well and truly monged
by Chris_P May 3, 2005
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