What is who shot john?

"Who shot John" is a colloquial expression in the English language that means "Who knows," "Who cares," or "I don't have the faintest idea." It does not refer to an actual person named John who was shot. Rather, it is a phrase that has been used for several decades or even centuries to deflect a question or express a lack of knowledge or interest in the subject. The origin of the phrase is unclear, but it may have derived from the fact that John is a common name, and if someone was shot, people would have asked, "Who shot John?" over and over again, leading to the phrase being used colloquially.