from The American Heritage® Dictionary of the English Language, 4th Edition

  • interj. Used to express disdain for something deemed stupid or obvious, especially a self-evident remark.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • interj. Disdainful indication that something is obvious.
  • interj. Indication of perceived stupidity, often used in mockery.


Imitative of an utterance attributed to slow-witted people.
(American Heritage® Dictionary of the English Language, Fourth Edition)



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