A mighty hunter and godking of Babylon and legendary founder of Mesoptamiam civilization.
Also a descendant of Noah.
Name popularized by Bugs Bunny calling the Elmer Fudd,
the hunter,"Nimrod".
This was mocking Elmer
sarcastically for being a poor hunter of wabbits.
Has
nothing to do with foolishness or stupidity outside of those who misinterpreted the quote from Loony Toons.