なんでやねん！
Why on earth! (classic Kansai comedic retort)
✦ AI pragmatic read · suggests Dialect
A loud, informal Kansai‑region retort used among friends or in comedy; it conveys playful disbelief and challenges the listener, unsuitable for polite or formal contexts.
A starting point, not the final word — open the entry to add your own note if you'd explain it differently.