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When you are in a foul mood, due to the actions of some one else, or when a child can't get their own way.
I told Jonny he couldn't buy that rc helicopter, he got a right monk on!
by Naffito January 10, 2009
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to be pissed with sum1
he's got the monk on wit her
by lulu May 14, 2003
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Def: to be in an unsatisfactory or grumpy mood.

Bearing in mind how little one sees a monk smile, to have a 'monkon' is to be unhappy, to be in a monk.
"What's wrong with Derric?"
"Dunno, but he's got a hefty monkon."
by Joe Fleming February 10, 2005
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