cat's pajamas

noun
variants: or British cat's pyjamas

Definition of cat's pajamas 

informal + old-fashioned

: a highly admired or exceptionally excellent person or thing He's the cat's pajamas, I couldn't love, respect, admire, and enjoy that individual more than I do. —Drew Barrymore, quoted in Harper's, 1 Oct. 2010

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First Known Use of cat's pajamas

1922, in the meaning defined above

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The first known use of cat's pajamas was in 1922

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