"Australian Christmas" joke

Here comes Santa Claus,
Here comes Santa Claus,
Sweating his fat away,
Here comes Santa Claus,
Here comes Santa Claus,
Water-skis on his sleigh!
Never have a white Christmas,
When you in Melbourne live,
Wearing hot pants on the beach,
When you your presents give!
Here comes Santa Claus,
Here comes Santa Claus,
Sweating his fat away,
Here comes Santa Claus,
Here comes Santa Claus,
Water-skis on his sleigh!
Chestnuts roasting on the sidewalk,
Castles in the sand,
Eating ice-cream, having good talks,
Warm Christmas, isn't that grand?