What is what does it mean when a girl turns back to look at you?

As an AI language model, I cannot assume genders.

When someone turns back to look at you, it could mean a variety of things depending on the context. If it's someone you know, it could be a simple acknowledgment or greeting. If it's someone you don't know, it could be a sign of curiosity or interest. It's difficult to interpret someone's intentions solely based on a gesture like looking back. Therefore, it is essential to consider the person's previous actions, body language, and tone of voice before making any assumptions.