No-duh meaning

(chiefly US, colloquial, sarcastic) An expression or exclamation that something is exceedingly obvious or apparent, or that one would have to be extremely foolish not to realize something immediately. [From 1962.]

It says here not to drive with the sun shade covering the windshield of your car. No duh!

interjection
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Origin of no-duh

  • US from 1962.

    From Wiktionary