The Collaborative International Dictionary of English v.0.48:
Wallah \Wal"lah\, n. (Zool.) A black variety of the jaguar; -- called also tapir tiger. [Written also walla.] [1913 Webster]WordNet (r) 3.0 (2006):
wallah n 1: usually in combination: person in charge of or employed at a particular thing; "a kitchen wallah"; "the book wallah"