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duh

[duh; often pronounced with a dentalized d]
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interjection
  1. (used to express annoyance at banality, obviousness, or stupidity.)Compare doh.
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Origin of duh

An Americanism dating back to 1960–65
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for duh

duh

interjection
  1. slang an ironic response to a question or statement, implying that the speaker is stupid or that the reply is obvioushow did you get in here? – through the door, duh
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012