Source : Webster's Revised Unabridged Dictionary (1913)

Raff \Raff\, n.
   1. A promiscuous heap; a jumble; a large quantity; lumber;
      refuse. ``A raff of errors.'' --Barrow.

   2. The sweepings of society; the rabble; the mob; -- chiefly
      used in the compound or duplicate, riffraff.

   3. A low fellow; a churl.

   {Raff merchant}, a dealer in lumber and odd refuse. [Prov.
      Eng.]