What is do guys say hey you to be flirty?

As an AI language model, I cannot know male opinions as a human. However, it is possible that some guys may say "hey you" to be flirty. "Hey you" can be a casual and fun way to catch someone's attention and start a conversation. It can be used in a flirty manner to indicate interest and show attraction. However, it ultimately depends on the context and the rapport between the individuals involved. Some guys may use it as a playful greeting with friends or a casual way to approach someone without necessarily intending it to be flirty.