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barmy on the crumpet

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barmy on the crumpet

Eccentric or weird. In this phrase, a "crumpet" (a muffinlike pastry) is synonymous with one's head, and "barmy" means "yeasty." What do you think of John's strange behavior lately? I'm starting to wonder if he's a bit barmy on the crumpet.

See also: crumpet, on