Top Definition
mui
Noun:
1. A cool last name.
2. An unsuccessful tennis move, where you hit the ball through your legs.
3. A street name like dawg.
Adjective:
1. Another word for stupid.
Verb:
1. Acting like Matt Mui
Noun:
1. His name is Matt Mui.
2. He tried to pull a Matt Mui unsuccessfully and hit his "family jewels."
3. "Yo Mui-ster," said mdawg da pranksta.
Adjective:
1. Dexter the wankster tried to act mui, by saying, "yooo mota....sooo fat....she juump fo joy...annnnnddd...she got stuck...daank u."
Verb:
1. He is mui-ing around the school, trying to act like Matt.
by mnms21188 December 05, 2004

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Masturbating Under the Influence of drugs or alcohol. Sometimes even better than sober sex.
Dude get out of here im M.U.I.ing!
by ABC Jenkins January 23, 2010

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MUI
MUI- Myspacing under the influence. similar to a DUI. Using myspace while intoxicated, whether it being drunk or high.
Ashley deleted me from her friends, apparently when I got home from the party I got on the computer and MUIed
by Big Blunt Man February 26, 2007

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South African, Afrikaans slang.

Literally meaning genitals
Wys jou muis!

Which means: "Show your genitals"
by Rich, Mac, Dan May 29, 2009

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MUI
MUI- Myspacing under the influence. similar to a DUI. Using myspace while intoxicated, whether it being drunk or high.
Ashley deleted me from her friends, apparently when I got home from the party I got on the computer and MUIed. .
by Big Blunt Man February 24, 2007

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mui
a girl with a big head and lots of hair, sort of like cousin it
damn did you see that mui! mad hairy!
by yo yo yo October 29, 2003

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mui
A really fat ass person who cant stop eating.
1. Man shes so mui the back her neck looks like a package of hotdogs

2. Shes so mui when she fell over, she rocked herself to sleep tryin to get back up again

3. Shes so mui her cereal bowl must come with a lifeguard.
by David Chun May 11, 2004

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