one banana short of a bunch

one banana short of a bunch

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 banana short of a bunch. Every time Paul tells me about his latest conspiracy theory, I can't help thinking that he's one banana short of a bunch.
See also: banana, bunch, of, one, short
Farlex Dictionary of Idioms. © 2015 Farlex, Inc, all rights reserved.
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