What is the meaning of Wallah?

A servant or other person responsible for something, often specified before it, for example kitchen wallah.

Short for competition wallah.

A guy or bloke.

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

VoilĂ .

Generic intensifier.

wow (an expression of surprise)

I'm serious

Generic intensifier.

right?

wallah (when making an oath)

Generic intensifier.

Source: wiktionary.org