n. a simpleton; a nerd. : What stupid nimrod left the lid off the cottage cheese?
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition. Copyright 2007. Published by McGraw Hill.
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Word Origin & History
Nimrod
"great hunter," 1712, in ref. to the biblical son of Cush, referred to (Gen. x.8-9) as "a mighty hunter before the Lord." It came to mean "geek, klutz" by 1983 in teenager slang, for unknown reasons.