The Collaborative International Dictionary of English v.0.48:

Potman \Pot"man\, n.; pl. Potmen.
   1. A pot companion. [Obs.] --Life of A. Wood (1663).
      [1913 Webster]

   2. A servant in a public house; a potboy.
      [1913 Webster]

WordNet (r) 3.0 (2006):

potman
    n 1: a worker in an inn or public house who serves customers and
         does various chores [syn: potboy, potman]