The Collaborative International Dictionary of English v.0.48:

Sundowner \Sun"down`er\, n.
   A tramp or vagabond in the Australian bush; -- so called from
   his coming to sheep stations at sunset of ask for supper and
   a bed, when it is too late to work; -- called also traveler
   and swagman (but not all swagmen are sundowners).

         Sundowners, -- men who loaf about till sunset, and then
         come in with the demand for unrefusable rations.
                                                  --Francis
                                                  Adams.
   [Webster 1913 Suppl.]

The Collaborative International Dictionary of English v.0.48:

Swagman \Swag"man\, n.
   A bushman carrying a swag and traveling on foot; -- called
   also swagsman, swagger, and swaggie.
   [Webster 1913 Suppl.]

         Once a jolly swagman sat beside a billabong
         Under the shade of a coolibah tree.
         And he sang as he sat and watched his billy boiling,
         `Who'll come a-waltzing Matilda with me?' --[Waltzing
                                                  Matilda, an
                                                  Australian
                                                  tune.]
   [PJC]

WordNet (r) 3.0 (2006):

swagman
    n 1: an itinerant Australian laborer who carries his personal
         belongings in a bundle as he travels around in search of
         work [syn: swagman, swagger, swaggie]