The phrase itself is everyday French, the standard polite answer when someone asks ca va, and it has circulated online as a short reusable audio reply rather than as a clip tied to one known show or creator. Its appeal online is its universality, anyone who has learned basic French recognises it instantly. Shared across chats and short videos, it works as a ready made line for appearing fine, unbothered or politely evasive, which is why it keeps being reused as a reaction sound.