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"Mu" is the correct answer to the classic trick question "Have you stopped beating your wife yet?". Assuming that you have no wife or you have never beaten your wife, the answer "yes" is wrong because it implies that you used to beat your wife and then stopped, but "no" is worse because it suggests that you have one and are still beating her. According to various Discordians and Douglas Hofstadter the correct answer is usually "mu", a Japanese word alleged to mean "Your question cannot be answered because it depends on incorrect assumptions".

Hackers tend to be sensitive to logical inadequacies in language, and many have adopted this suggestion with enthusiasm. The word "mu" is actually from Chinese, meaning "nothing"; it is used in mainstream Japanese in that sense, but native speakers do not recognise the Discordian question-denying use.

Thanks to Thrakem for the source of this definition.
A monk asked Joshu, "Does a dog have the Buddha nature?"
Joshu retorted, "Mu!"
by IKEA January 21, 2004
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a Greek letter used in physics to represent a frictional constant of a surface.
For this surface, mu k equals .3825

Beware of physics cows, they go "muuuuuuuuuuuuuuuuuuuuuuu..."

by Mike the Ekim December 24, 2005
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A "Member Update" on any sort of forum or message board. They are usually weekly or bi-weekly, and they log the post gains of the members on a certain board. Top spammers spots are coveted.
by gtiff123 April 20, 2005
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"MU" (Pronounced Moo) is short for Mentally Undressing.
It is when a person is flirting with a member of the opposite sex whilst staring at their physical form. A witness or a friend of the person flirting must then say aloud the word "MU".
Two friends witnessing a man flirting with a woman.
Friend 1: "That guy is totally MU-ing that woman"
Friend 2: "I know...MU!"


A friend witnessing a man flirting with a woman.
Friend (aloud): "MU!!!"
by MNNGJ September 20, 2011
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Mu is a letter in the Greek Alphabet. Equivilent to our "M".
Cows don't say mu.......
by Wickedax September 25, 2005
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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?

by Tezuka-chan April 04, 2009
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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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