Duh Definition
dŭ
interjection
Used, jocularly, to signify a lack of knowledge or comprehension.
Webster's New World
Used in response to something said that is too obvious to need to be mentioned.
“Physics is really hard.” “Well, duh.”
Webster's New World
Origin of Duh
Imitative of an utterance attributed to slow-witted people
From American Heritage Dictionary of the English Language, 5th Edition
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