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Meaning of McCoy

Mc•Coy

Pronunciation: (mu-koi'), [key]
— n.
  1. the genuine thing or person as promised, stated, or implied (usually prec. by the or the real): Those other paintings are copies, but this one is the McCoy.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.