wallah

Etymology 1

Either from Hindi -वाला (-vālā, “pertaining to”) or from Hindi वाला (vālā, “person in charge”), from Sanskrit पाल (pāla, “protector”), from Proto-Indo-European *peh₂- (“protect”).

noun

1. (India) A servant or other person responsible for something, often specified before it, for example kitchen wallah.
   Kindly take one of my cigarettes, sir. Do you not admire my new silver case, sir? From the boxwallah, two rupees eight annas. 1931, George Orwell, A Hanging
2. (India, historical) Short for competition wallah.
3. (Britain, slang) A guy or bloke.

Etymology 2

From Arabic وَٱللّٰه (wa-llāh, literally “by God”).

adv

1. (Islam) by God (Allah); may God be my witness used in making a solemn oath

Etymology 3

A corruption of voilà.

intj

1. Voilà.