Mewing started as an online tongue posture technique and turned into a huge TikTok and meme joke about jawlines, looks and silent confidence. Short farewell clips saying bye bye to mewing spread as a punchline for giving up the trend or ending a streak. Reversing the audio became a popular extra twist, shared in edits where the joke is that the goodbye itself sounds wrong. The reversed version keeps circulating because it works without context, as a short, strange sound people recognise from the wider mewing meme.