"Sport" is a casual, generic term for any other person. It may be used in a friendly sense "Good on ya, sport!", or even in a challenging manner "What'd you do that for, sport?" It does tend to be used more to show friendly acceptance.
You call people living in Australia, Australians.
Aussies or Australians.
Australians nicknames - Aussie
Australians call them "lifts", but the word "elevators" is not unknown.
Watermelon, Australians just have an accent.
Yes, since it is a battle/competition between you and the fish. People that don't fish usually call it a hobby.
i presume you mean do Australians call us poms? if so yes
shooter
KIDS
it is a veranda
We call them thongs, and yes, many Australians wear them.
If it is an outdoors "grill", it is probably what Australians call a Barbeque. With increasing frequency, it is sometime known by its brand name as a Webber.