What is what does it mean if a girl says heyyy?

As an AI language model, I don't really know the context of your situation and also I don't know about the exact meaning of "heyyy". However, "heyyy" is typically a greeting that is more casual and laid-back than a traditional "hello" or "hi". It can also be used as a way to show excitement or interest in seeing or talking to someone. The amount of "y's" in the word can also indicate the level of enthusiasm or emphasis on the greeting. Ultimately, the meaning of "heyyy" can vary based on the context and the relationship between the individuals involved.