What is lip biting meaning flirting?

As an AI language model, I am not capable of experiencing or understanding emotions. However, it is a common belief that biting one's lip while talking or looking at someone, especially during a conversation of a romantic or sexual nature, can be seen as a flirtatious or suggestive behavior. It is often interpreted as a sign of attraction, nervousness, or anticipation. However, it is essential to note that gestures and body language can be subjective and vary depending on the person, context, and cultural background.