The "biting lip" emoji 🫦 depicts a person's mouth 👄 with their lower lip being bitten down on.
This emoji is often used to convey feelings of anxiety, nervousness or tension. It can also be used to suggest a sense of apprehension or discomfort, or to indicate that the sender is feeling conflicted or unsure about something. Additionally, this emoji can be used as a flirtatious gesture, particularly when accompanied by other emojis or suggestive language.