Wallah

[Justin Bieber]

An Arabic word that means I swear to God. or I swear to Allah.

[Jessica]

A shortened, slang term for Waheyat Allah, which means I swear to God in Arabic. Arab and non-Arab teens in America use this word commonly.

[Rihanna]

Means I swear (usually to God.)

Not a swear word.

Also I Promise.

[Couch Potatoe]

The word ignorant people use when they really meant to say [voilà].

[Mark Zuckerberg]

[n] (India) usually in combination: person in charge of or employed at a particular thing; a kitchen wallah; the book wallah

[Mark Zuckerberg]

A Wallah is a person in India, or other Indian based countries, that carries out a manual task.
A Punkawallah pulls a string and acts as a manual fan for rich people. A Dabbawallah collects lunchboxes off the office workers and fills them and takes their lunch to them.

[Zipporah Schumaker]

Arabic, meaning Oh my god in English. Heard everywhere in Dearborn Michigan.

[Sonia]

\Wallah, n. (Zo[o]l.)
A black variety of the jaguar; -- called also {tapir tiger}.
[Written also {walla}.]

[Dave Paprocki]

the old term given in the mid 90s to lebs

[Raeanne Dimick]

A black variety of the jaguar; -- called also tapir tiger.

[Julene]

Wallah (In [Arabic]: والله)
An Arabic word means [I swear to god], its also used to ask somebody to [swear to god].

[Britney]

Previously known as an Arabic word meaning “ I swear [to Allah]” but currently [being used] by all people as a term of saying “trust me this is the truth” mostly used to [cover up] lies

[PussyCat]

A person concerned or involved with a specified thing or business.

[Mary Mallozziberg]

(in compounds) a person who has a particular duty: