Real-mckoy definition

(idiomatic) The genuine thing, neither a substitute nor an imitation.
noun
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Origin of real-mckoy

  • Corruption of Scots the real MacKay, this latter attested in 1856 as “A drappie o’ the real MacKay” (A drop of the real MacKay).

    From Wiktionary

  • How “MacKay” became “McCoy” is unclear; first attested in the form “McCoy” in the US in 1908:

    From Wiktionary

  • The term is the subject of many folk etymologies, discussed at the Wikipedia entry.

    From Wiktionary