noun Slang.
a stupid, foolish, or scatterbrained person.

1920–25; bird + brain

birdbrained, bird-brained, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Slang Dictionary

birdbrain definition

  1. n.
    a stupid-acting person. : I'm such a birdbrain. I forgot my driver's license, officer.
  2. mod.
    and birdbrained. stupid. : Look, you birdbrained idiot, you are dead wrong!
Dictionary of American Slang and Colloquial Expressions by Richard A. Spears.Fourth Edition.
Copyright 2007. Published by McGraw-Hill Education.
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