Source : Webster's Revised Unabridged Dictionary (1913)

Jobbing \Job"bing\, a.
   1. Doing chance work or add jobs; as, a jobbing carpenter.

   2. Using opportunities of public service for private gain;
      as, a jobbing politician. --London Sat. Rev.

   {Jobbing house}, a mercantile establishment which buys from
      importers, wholesalers or manufacturers, and sells to
      retailers. [U.S.]