Mu is a letter in the Greek Alphabet. Equivilent to our "M".
Cows don't say mu.......
by Wickedax September 26, 2005
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a sperm stain

properly used it pass tense and present only
Ex. Clean that mus on your shirt.
by CDrez December 13, 2007
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A male student often refered to as a prized item, when in reality they are nothing more than a dirty redneck southern pride douche bag. They like to sit in class and play the biscuit game with each other and enjoy loosing. The boys here are really gay and they like to eat cake. Often times you can find them at Backstreet down in midtown, Memphis performing all kinds of fellatio. These mussies tend to get it in the arse atleast, but not stopped at, 6 times a day.
That kid is gay, he must go to MUS, or atleast attended it once in his lifetime.

Wow did you see that fag run away!? He goes to mus!
by hairysachez December 12, 2007
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Q: Do you wish to gobble upon my impressive member? Yes or no?

A: Mu.
by TV Spunk January 30, 2003
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One of the twelve main zodiac knights from the japanese television show called Saint Seiya (Knights of the Zodiac) . The show was created in 1988 in November by Masami Kuramada. Based on the manga series it was then turned into a TV series and then brought to the United States in the mid-1990's .

Mu is the Aries Saint of Athena and repairs the armors of other saints. He has a deciple named Kiki and their training grounds is in Tibet.
Who lives in the first temple of the twelve main zodiac knights?

Mu!!
by Tezuka-chan April 5, 2009
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Person 1: 'you two officially broke up?'
Person 2: 'yeah, we had a MU and ended it peacefully.'
by Kitten0407 April 10, 2017
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A term used to describe a person who is always lofting around the place.

Aqmad: What are we even talking about?
Mohammed: Come you mus, wake up.
by Monsieur Blanc3 April 7, 2009
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