one egg short of a dozen

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one egg short of a dozen

A derogatory phrase meaning not very intelligent or of questionable mental capacity. He says he's going to start a business selling bees as pets—I think he may be one egg short of a dozen. Every time Paul tells me about his latest conspiracy theory, I can't help thinking that he's one egg short of a dozen.
See also: dozen, egg, of, one, short
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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