the genuine thing or person as promised, stated, or implied (usually preceded by the or the real ): Those other paintings are copies, but this one is the McCoy.

1880–85; also Mackay, McKie, the clear McCoy (of liquor); of uncertain origin; hypothesized identifications with Mackay, a Scottish clan, and Kid McCoy, nickname of U.S. boxer Norman Selby (1873–1940), are unsubstantiated Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
McCoy1 (məˈkɔɪ)
slang the genuine person or thing (esp in the phrase the real McCoy)
[C20: perhaps after Kid McCoy, professional name of Norman Selby (1873--1940), American boxer, who was called ``the real McCoy'' to distinguish him from another boxer of that name]

McCoy2 (məˈkɔɪ)
Tony, full name Anthony Peter McCoy. born 1974, Northern Irish jockey; winner of seven consecutive riders' titles in 2001--02

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

as in the real McCoy, 1922, from Scot. the real Mackay (1883), of uncertain origin, though there are many candidates, including whiskey distilled by A. and M. Mackay of Glasgow (the phrase the real McCoy became popular during Prohibition to describe liquor); Charles S. "Kid" McCoy (1872-1940), former
welterweight boxing champ; and a claimant for chief of the northern branch of the clan Mackay.
Online Etymology Dictionary, © 2010 Douglas Harper
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