The phrase is everyday Turkish, with goruyon mu being a colloquial spoken form of goruyor musun, and its popularity as a clip comes from how universally it fits reaction editing. Shared as a standalone sound on soundboards and in short videos, it spread because viewers do not need the original context to understand the attitude behind it. It is now used less as a quote from a specific scene and more as a reusable reaction, dropped over fails, surprises and moments that speak for themselves.