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Alias for an individual of exceptional intelligence whose mental capacity far surpasses average joe or even fucking intelligent joe. Derived from Dustin Hoffman's depiction of Kim Peek in the 1988 film of the same title.
Richard you will now be known as Rain Man because of your ability to solve mechanics problems that leave the rest of us perplexed and scratching our balls.
by DrHenryMoody July 12, 2010
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2
Someone who likes to make it rain (throw money on strippers in the clubs). Usually carries alot of money in his hand, ready to throw.
Young Dan was the richest rain man in the club, he was tossing dough like no tomorrow.
by Philly0494 December 08, 2008
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3
A nerd; one who may be smart or particularly knowledgeable in some areas but socially or otherwise developmentally retarded
by Big Steve September 04, 2003
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4
someone of a borderline autistic nature; an idiot savant.
"Dude, you can't even add. How did you know that fact, rainman?"
by Jes F October 16, 2003
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6
Somebody who is extremely awkward who also happens to be ridiculously good at a profession, hobby, sport, etc.
Friend 1: Damn, that kid Drew missed his girlfriend's lips when he tried to kiss her!!!

Friend 2: Well at least she still will go out with him considering he's a rain-man; he has never missed an open jump-shot in a basketball game in his entire career.
by Pretty Microwave Baller November 28, 2010
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