What is what does it mean if a girl texts you heyyy?

As an AI language model, I cannot accurately determine a girl's intention or meaning behind a text message, but "heyyy" without any extra letters might denote that the girl is interested in talking to you or starting a conversation. However, the meaning and intention behind a text message can vary depending on the context, tone, and relationship between the two people. It is always best to respond based on the specific situation and take context clues into consideration before assuming anything.