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Derived from the word "mundane", a mun is the author writing for a character in an online RPG. Can also be used as a suffix to denote a reference to a character's player rather than the character. Synonymous with certain connotations of roleplayer, author, player.
"That mun may be an idiot, but I can't fault his playing style."

"Do you think Wren-mun's coming tonight? I want to finish this RP with her."
by Riku December 24, 2003
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2
Acronym for "model United Nations," either a club or class, usu. in high schools; an extremely time-consuming activity where one student learns about international policies and takes on the role of a delegate for a particular country to discuss any given topic.

(Other-- Known to cause high school students to stay up late in researching.)
"I'm representing France in the committee of IAEA," said the M.U.N. student.
by Strokes fan February 01, 2004
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3
the man or woman behind a character in role-playing.
If the person in role-playing online, and their screenname is Ayisha369, then, when speaking out of character, she would be referred to as Ayisha-mun.
by Ninkubator November 29, 2005
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Welsh equivalent of 'man', as used for emphasis.
'Aawww, come on, mun, I only want to borrow your car to go mewling.'
by The Moai April 19, 2005
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Welsh version of "man" often used to

1. Express Anger
2. Greet a person
1. STOP IT MUN!

2. Alright Mun what's occuring?
by colourmeprettyx May 12, 2009
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