Definition of McCoy in English:

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Pronunciation: /məˈkɔɪ/


(in phrase the real McCoy) informal
The real thing; the genuine article: the apparent fake turned out to be the real McCoy
More example sentences
  • But Japan, of all countries, is mastering the art of producing the real McCoy, though many of its whisky-lovers tend to become wobbly-legged after only two drinks.
  • Yet after running into him at a Hillary-bashing conference last April, and having him repeatedly call me a liar and ‘disgusting’ to my face, I concluded that he was actually the real McCoy.
  • You also have the real McCoy, although all the evidence I'm getting is that the real problem is former Warsaw Pact weapons.


Mid 19th century: first appears as the real Mackay, in which real may be a corruption of the name of the Reay branch of the Scottish Mackay family.

  • The source of the real McCoy is far from clear. The trouble is that McCoy is a relatively common surname and so there are numerous candidates for the post of the original McCoy. The earliest example of the phrase, dating from 1856, is Scottish, uses the form McKay, and describes a brand of whisky: ‘a drappie [drop] o' the real McKay’. The distillers G. Mackay and Co. apparently adopted ‘the Real Mackay’ as an advertising slogan in 1870, and this was the form familiar to novelist Robert Louis Stevenson, who used it to mean ‘the genuine article’ in a letter in 1883. It seems clear that the expression was well established as the real McKay by the end of the 19th century, but in the early part of the next century most examples have the McCoy spelling and are American. Possibly the most likely reason for this spelling change is one Norman Selby, also known as Charles ‘Kid’ McCoy. He was an American boxer who became welterweight champion in 1896 after knocking out Tommy Ryan, his sparring partner, to whom he had previously pretended to be ill and unfit. Apparently he often used this trick of feigning illness, only to appear fighting fit on the day itself, prompting commentators to wonder whether this was the real McCoy.

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