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A stupid person. Did you hear that guy's ridiculous question? Geez, what a beetlebrain.
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
n. a stupid person. Why are you such a beetlebrain when it comes to math?
McGraw-Hill's Dictionary of American Slang and Colloquial Expressions Copyright © 2006 by The McGraw-Hill Companies, Inc. All rights reserved.