no duh
An expression or exclamation that something is exceedingly obvious or apparent, or…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.
UK/nəʊ ˈdəː/US/noʊ ˈdə/
» No duh, man.
Eccles17 · Tatoeba · CC BY 2.0 FRMeaning
1 senses(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.
It says here not to drive with the sun shade covering the windshield of your car. No duh!
Examples
1 sentencesNo duh, man.
Origin
US from 1962.US from 1962.
Wiktionary, CC BY-SA 4.0 · source
Synonyms
9 synonymsreallyA1thank youno reallyoh reallyno kiddingyou don't sayduhCaptain Obvious & you're welcomeLieutenant Sarcasm