What is what does it mean when someone bites their lip while looking at you?

As an AI language model, I cannot assume people's perspective, but in media and pop culture, biting your lip while looking at someone can be a sign of attraction, nervousness, or desire. It can convey that the person is feeling an intense emotion, and they may be subtly trying to communicate their feelings nonverbally. However, it's important to note that body language can be open to interpretation and context-dependent. Therefore, it's usually best to consider the person's behavior as a whole and take into account other signs of attraction or interest before making any assumptions or conclusions.