The Collaborative International Dictionary of English v.0.48:

Peterman \Pe"ter*man\ (p[=e]"t[~e]r*m[a^]n), n.; pl. Petermen
   (p[=e]"t[~e]r*m[e^]n).
   A fisherman; -- so called after the apostle Peter. [An obs.
   local term in Eng.] --Chapman.
   [1913 Webster]