Source : Webster's Revised Unabridged Dictionary (1913)

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

Source : WordNet®

wallah
     n : usually in combination: person in charge of or employed at a
         particular thing; "a kitchen wallah"; "the book wallah"