Definitions from Wiktionary (rain man)

▸ noun:  (derogatory) An autistic, or mentally and/or socially impaired person.
▸ noun:  (derogatory) A non-autistic or impaired person whose mannerisms are similar to such people.
▸ noun:  (humorous) An expert at something.
▸ noun:  A man who is believed to have power to control the rain.
▸ noun:  A spirit of the rain.

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