Green’s Dictionary of Slang

(Aus./W.I.) unsophisticated, countrified.

1869		H.B. Stowe Oldtown Folks 191: Them wild Injuns [...] they’re so kind o’ wild, and birchy, and bushy as a body may say.
1901		W.S. Walker In the Blood 190: A bright-eyed, energetic girl, so thoroughly Australian in her ready wit and courage to do anything ‘bushy’.
1912		Bulletin (Sydney) 21 Nov. 15/4: It’s all very well for all these bushy ‘Abos’ to keep slinging off at the immigrant idiot, and his throw-the-cow-to-milk-her performances.