Wiktionary
real mccoy
n. (context idiomatic English) The genuine thing, neither a substitute nor an imitation.
WordNet
real McCoy
n. informal usage attributing authenticity [syn: real thing, real stuff]
Wikipedia
Real McCoy (band)
Real McCoy, originally known as M.C. Sar & The Real McCoy, is a German musical group, best known for their '90s singles " Another Night" and " Run Away", which were both Top 10 hits worldwide.
Usage examples of "real mccoy".
I suppose they figured it would legitimize the whole operation to include the real McCoy, so to speak, but then somebody has to decide who gets him.