noun
A derogatory term used to describe someone who is considered stupid or foolish.
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The doctor explained that the patient's cognitive abilities were affected due to a condition known as durr-brain.
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Don't listen to him, he's just a durr-brain when it comes to technology.
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I can't believe I forgot my keys again, I'm such a durr-brain.
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Her mind was like a durr-brain, unable to grasp the complexity of the situation.