Top definition
A person with a fragile mindset and lacking the ability to deal with tough situations. Feeble.
Whenever Mitch is given constructive criticism, he turns into a total mental midget and starts freaking out thinking he is going to get fired and becomes all pissy and whiny. He can't mentally deal with pressure and folds like a cheap lawn chair.
by mflannery420 April 05, 2011
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2
A person of extremely low I.Q.. Prone to being clueless in all aspects of life.
That guy is such a mental midget, it's almost criminal that he be allowed to live.
by Ghost July 27, 2003
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3
a person who is narrow-minded or has limited knowledge or insight to anything outside his or her immediate life.

basically someone who lacks education or higher thought.
I tried to start a conversation about Hapsburg Europe with that hot looking babe at the party who is supposedly a history major.
turns out she's just another mental midget, since all she talked about was her ex boyfriend Diego and her Mary Kay cosmetics collection!
by polo June 18, 2005
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4
George W. Bush is such a mental midget
by My Name Is Hugh...Mungus October 17, 2007
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5
Brad Lidge

See MLB 2009 Regular Season
See MLB 2009 playoffs
I never should have bet the Phillies in my MLB parlay... Brad Lidge can't close games and gets so easily rattled when he puts runners on base. That guy is a mental midget. Fucking Brad Lidge....
by payday0023 November 04, 2009
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