Green’s Dictionary of Slang

(Aus.) worn-out, ill-bred, uncouth; also as n.

1890		Truth (Sydney) 16 Nov. 415: It is wonderful to witness the number of sky pilots, devil-dodgers and brumby parsons who visit the house [AND].
1902		Bulletin (Sydney) 13 Dec. 17/3: I goes fer ’im wid a three-legged stool, an’ ’e clears fer ’is natarel, the brumby!
1911		St. C. Grondona Collar and Cuffs 98: They were a brumbie lot of routers, all swagmen, and to all appearance at least, considerably down on their uppers [AND].
1921		Aussie (Sydney) Nov. 21/1: I’ve just started in to fence my new selection in the scrub, All unbroken, brumby mallee, limestone ridge, an’ loam [AND].
1930		‘Brent of Bin Bin’ Ten Creeks Run (1952) 3: Mrs. Saunders had an ex-sailor in the kitchen and in the house proper a couple of brumby girls [AND].