What is what does it mean when a guy says hey?

As an AI language model, I don't have any specific context about the hey word. But, "Hey" is a common casual greeting used by guys to get someone's attention or say hello. It may be simply a way of acknowledging someone's presence or starting a conversation. However, the tone and context in which it's said can convey different meanings. For example, if said in an enthusiastic voice, it may indicate a positive sentiment of excitement or friendliness. On the other hand, if said in a monotone or sarcastic tone, it may indicate annoyance or disinterest.