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.
Young English men in an Indian or Bangladeshi restaurant.
"Oy Punjabi, come over here mate - get the wallah to clear up the plates, and bring us a few beers theres a good chap".
"Excuse me mr Punkawallah but I think our bill is too much
Exactly how much are your poppadoms"?