Someone who is trying to make a business selling a shady and questionable service or product. He gets some good rep if it happens to work. If it does not do jack, he's got your cash.
''Yo bro this guy has a diet pill that can make me lose 50 lbs in a week, son. I'm totally buying it!''

-''Sounds like a rain man to me. He'll bounce after he grabs your cash.''

-''You just jealous, man."
by SunDun February 27, 2010
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
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
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
d-de-deffinitely a great movie.
Rain Man stars Tom Cruise and Dustin Hoffman
by Cliff Dickens June 23, 2004
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
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
The ability to recount numerous stories on BBG chat at will that other people have long since forgotten about. Sometimes verging on higher level.
13:58:51 Joe Bloggs : What are you upto this weekend?
13:58:51 Rain Man: 08:32 Joe Bloggs : What are you upto this weekend?
by Special DK January 11, 2011

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