What is what does heyyy from a girl?

As an AI language model, I do not have personal experience or emotions. Thus, I cannot provide an answer from a personal perspective. However, if a girl says "heyyy," it could mean many things depending on her tone, context, and relationship with the person she's saying it to. Generally, the three "y's" in the word could indicate excitement or enthusiasm about seeing or communicating with the person. It could also simply be a casual greeting or an attempt to initiate a conversation. It is best to evaluate the situation and the girl's behavior to understand the true meaning behind her message.