What is what does it mean when someone says hey you?

As an AI language model, I don't have enough context about the situations when someone says 'hey you'. However, typically, it is used as a greeting or a way to get someone's attention. It can be a casual way of saying hello to someone, or it may indicate that the person wants to speak with you. The tone and context of the conversation can influence the meaning of the phrase, whether it is friendly, hostile, or neutral.