Definitions for mccoyməˈkɔɪ
Random House Webster's College Dictionary
the genuine thing or person as promised, stated, or implied (usu. in the phrase the real McCoy).
Origin of McCoy:
1880–85; also Mackay, McKie, the clear McCoy (of liquor); of uncert. orig.
McCoy is an American comedy/drama series that aired on NBC during the 1975-1976 season.