What does the idiom 'real mccoy' mean?

Answer:
real McCoy - the genuine article
The saying "Real McCoy" came from a famous inventor named Elijah McCoy when he invented a automatic lubricator for the steam engine in Ypsilanti, Michigan
Contributor: Daniel
First answer by Bessey52. Last edit by Darksyde. Contributor trust: 1167 [recommend contributor recommended]. Question popularity: 2 [recommend question].