Definition from Wiktionary, the free dictionary
(Redirected from the real McCoy)
How “MacKay” became “McCoy” is unclear; first attested in the form “McCoy” in the US in 1908:
- I took a good-size snort out of that big bottle [of furniture polish] in the middle....Have you none of the clear McCoy handy around the house?
The term is the subject of many folk etymologies, discussed at the Wikipedia entry.