The Collaborative International Dictionary of English v.0.48:

Mosey \Mo"sey\, v. i. [Perh. fr. Vamose.]
   To go, or move (in a certain manner); -- usually with out,
   off, along, etc. [Colloq.] --E. N. Wescott.
   [Webster 1913 Suppl.]

WordNet (r) 3.0 (2006):

mosey
    v 1: walk leisurely [syn: amble, mosey]

Moby Thesaurus II by Grady Ward, 1.0:

63 Moby Thesaurus words for "mosey":
   amble, be getting along, buzz off, claudicate, come away, crawl,
   creep, depart, dogtrot, drag, drag along, drag out, drift, exit,
   gang along, get along, get away, get off, get on, get under way,
   go, go along, go away, go dead slow, go off, go on, go slow,
   hobble, idle, inch, inch along, jog-trot, laze, leave, limp,
   linger, march off, mope, move away, move off, move out, muck, poke,
   poke along, pull out, sashay, sashay off, saunter, shuffle along,
   stagger along, stroll, take flight, take wing, toddle,
   toddle along, totter along, traipse, up and go, waddle, walk,
   wing it, worm, worm along