The phrase comes from everyday Arabic speech, where ya rabaah is an emotional cry to God and mustaheel means impossible, so the repeated line works as a dramatic way of saying something cannot be true. Shared as a short reaction sound, it has travelled through Arabic-language meme and reaction videos, where creators reuse it whenever a moment needs instant disbelief without explanation. Its appeal is similar to the English oh my god, wow reaction, because both turn shock into a short, repeatable punchline that viewers recognise immediately, even if they do not speak the language.