When a hot girl tries to pander to the nerdy crowd by claiming to be a nerd. Usually an actress or booth-babe at a convention.

Named after Olivia Munn from Attack of the Show and The Daily Show
Check out that chick in the Princess Leia costume! I can't believe she is into Star Wars!

Dude, she's just Munning
by Play with us Danny May 5, 2011
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A diminutive word for money.
Person A: I just got my paycheck!
Person B: Cool!
Person A: Yeah. So many mun-muns. ^_^
by GauTruc August 21, 2010
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refers to girl's vagina. (hilonggo)
hugasi ang mun-mun mo. (wash your vagina).
by peach blossom June 27, 2011
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To lack foresight. To be duped into something. To unwittingly enter into an agreement which, to the average human, will result in an obvious negative consequence.
Shopper: ‘How much for this apple?’

Shopkeeper: ‘Well, normally it’s 25p however, today we are offering it at a discounted rate of 24p, if you also purchase this shiney poo sandwich for £2.49’

Shopper ponders: ‘Sounds like a bargain…I'll have 2 please’

Shopper gets Munned.
by The Urban Fox Hunter September 25, 2009
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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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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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