The term mewing comes from a tongue-posture technique meant to shape the jaw over time, and it became a running joke and self-improvement trend on TikTok as creators filmed side profiles, jaw clenches and transformation edits. The meme sound grew alongside those clips, giving editors a ready-made cue for a confident reveal without needing dialogue. It spread through short-form edits, reaction videos and gym or glow-up montages, and it remains popular because the joke is instantly readable even to viewers who have never tried mewing themselves.