It is? Don't think so, it comes from calling police officers "Copper", after the metal that made the original shields. In fact it was considered an insult to call a police man a "cop" until as recently as the 1930's.
It is? Don't think so, it comes from calling police officers "Copper", after the metal that made the original shields. In fact it was considered an insult to call a police man a "cop" until as recently as the 1930's.