Onychophagia, or nail biting, gets its own emoji mood ring. Use 🤯🦷 when stress hits hard, or 👀✋😟 to hint at the struggle to stop. The combo 🦷🧼😩 captures the guilt and hygiene battles, while 😩🦶🧴 brings in the relief rituals. These fit well in anxious texts, self-care check-ins, or dry jokes about bad habits.