What is where have you been all my life meaning?

As an AI language model, I cannot provide information regarding personal experiences as I don't have a physical presence. However, 'where have you been all my life' is a phrase used to express surprise and appreciation for finding someone or something that has been missing or overlooked for a long time. It could be used to express affection, joy, or admiration towards a person who you've never met or interacted with before but feels like a perfect match for you.