a few cards shy of a (full) deck

a few cards shy of a (full) deck

A derogatory phrase meaning not very intelligent or of questionable mental capacity. It can appear in many different forms and variations (for example: a few sandwiches shy of a picnic, one card shy of a full deck, etc.). He says he's going to start a business selling bees as pets—I think he may be a few cards shy of a full deck. The new manager is nice enough, but he's a few cards shy of a deck, if you ask me. Tommy's a few cards shy of a full deck if he thinks he can convince our mother to let him get a tattoo for his birthday.
See also: card, deck, few, of, shy
Farlex Dictionary of Idioms. © 2022 Farlex, Inc, all rights reserved.
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