Mewing takes its name from orthodontist Mike Mew and the tongue posture technique promoted online, which exploded on TikTok as part of looksmaxxing and sigma culture. Short sounds built around the trend spread through edits, duets and reaction videos, often paired with the related bye bye mewing farewell format. Creators reuse the clip not for instruction but for irony, exaggerating jawline obsession and silent, stoic posing. Its popularity comes from instant recognition, letting a single sound explain the whole joke without any dialogue or caption.