Definition of "bushie"

I bought the king parrot from an old bushie in a pub in Exhibition Street.

1985, Peter Carey, Illywhacker, Faber and Faber, published 2003, page 184

Timber was a sign of poverty, of our poor-white condition and backwardness: it made ‘bushies’ of us.

1998, David Malouf, A First Place, Vintage, published 2015, page 179