An individual who is very intelligent but acts oddly. An eccentric.
Our IT guy is brilliant but he is mensane.
by Spinroyd July 15, 2016
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Member of Mensa. Mensa is the high IQ society and membership requires an IQ in the top 2% of the population.

It by no means surprises me that nobody on this site knows what Mensa is!

by the voice of reason April 24, 2003
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Latin for "He who got his ass kicked daily in junior high."
THe Mensa meeting was full of mensans who rose above their less fortunate classmates' petty jealousies.
by TBoneMcKoy May 16, 2008
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Noun

What they label a severely, socially inept "genius" to make them feel special.
Man, someone needs to tell that mensan to use deodorant!

Someone needs to teach that mensan some social skills... that way he can find a real chick and stop wacking his peepee to Internet porn!

Hey mensan, guessing on the majority of the questions on your IQ test, and getting them correct, does not make you a genius.
by Yoda September 30, 2003
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1 Farm team for the Four Sigma Society
2 Old slang for someone with a flat head
3 Someone who knows why _not_ to play the lottery
4 Me
That dude got a 29 on the ACT in high school in '82, and didn't know that made him a mensan until '02! Some genius, huh?
by danw December 22, 2003
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