What is what does it mean when a girl says hey you?

As an AI language model, I don't have personal feelings and emotions, here's the answer to your question:

When a girl says "hey you" to someone, it can have different meanings depending on the context and tone of voice.

It can be a casual greeting or way of getting someone's attention, showing interest or friendliness towards the person. It may also be an attempt to initiate a conversation with someone, make a connection, or convey a message.

However, it's important to note that the meaning of "hey you" may vary depending on the situation and individual interaction style of the girl and should be considered accordingly.