rain man

Meanings

1. An autistic, or mentally and/or socially impaired person.
2. A non-autistic or impaired person whose mannerisms are similar to such people.
3. An expert at something.

1. A man who is believed to have power to control the rain.
2. A spirit of the rain.

Etymology

From the 1988 film Rain Man, about an autistic man with the name Raymond, misinterpreted as “Rain man” by his brother in childhood.