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