An incomplete Glossary of Australasian and obscure terms:
Billabong: A waterhole that dries up during the dry season.
Billy: A kettle used for camp cooking, especially to boil water for tea.
Box: When referring to plants, it can be any of a number of trees and shrubs, especially those of genus Buxus or genus Eucalyptus.
Cocky/cockatoo: A small-time farmer.
Coolabah: (more often Coolibah) Eucalyptus microtheca. The leaves of the Eucalyptus hang sideways, with the narrow edge to the sun, as an adaptation to drought. Hence they are famous for not providing shade.
Edward Rex: (Rex = King) Edward VII, 1841-1910, King of the United Kingdom (and therefore nominal head of state in Australia) from 1901 to 1910.
Fi. fa.: fieri facias—a legal paper authorising the seizure of a debtor's goods.
Flash: Ostentatious; fake; (obsolete) relating to shady characters.
Gully-raker: A person who musters unbranded cattle (or horses).