"The Real McCoy" is a phrase used to describe something that is genuine or authentic, as opposed to a fake or imitation. The origin of the expression is often attributed to the African American inventor Elijah McCoy, who created a superior lubrication system for steam engines in the late 19th century. His invention was so effective that people began asking for "the real McCoy" to ensure they were getting the original product. Over time, the phrase has evolved to refer to anything that is considered the best or most authentic version of something. It is commonly used in various contexts, from products to experiences, to emphasize quality and originality.