An exclamation expressing stupidity, confusion, or a sarcastic response to something obvious.
Onomatopoetic origin, likely 20th century slang; related to 'duh.' Possibly derived from the sound of someone being knocked down or the stuttering sound of confusion.
Durr is internet-age slang that spread through gaming and meme culture—it's the sound of social rudeness packaged as a single syllable, making it one of the few interjections that actually sounds mean when you say it out loud.
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