عَرْمَى وَاللّٰهِ

is a dialect var. of أَمَا وَاللّٰهِ, (IAar, K, TA,) as also [غَرْمَى واللّٰه, and] حَرْمَى وَاللّٰهِ: one says, عَرْمَى وَاللّٰهِ لَأَفْعَلَنٌ كَذَا [Verily, or now surely, by God, I will indeed do such a thing]. (IAar, TA.)