Green’s Dictionary of Slang

(Aus.) a fool, a general term of abuse.

1973		D. Forster North South West 17: You’ve only got to look at all the bushwacking, nest feathering dubbos we got for Education ministers [...] to know something’s wrong with the system [GAW4].
1979		Lette & Carey Puberty Blues 46: ‘Sprung!’ cried Jeff Basin, the local dubbo.
1983		R. Aven-Bray Ridgey-Didge Oz Jack Lang 10: The kings annoyed was not at all what the dubbos had told him.
1986		R.G. Barrett Real Thing 155: You clown [...] You Dubbo, Les.
1990		Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Dubbo. A simple countrified prisoner. Dubbo is a rural town in western NSW.
1992		R.G. Barrett White Shoes 127: If you hadn’t tossed your drink in that bloke’s face, I mightn’t of got whupped. You...Dubbo!
2007		D. Brewerton Impeccable Sources 83: What was the point? Why was she was working with such a bunch of dubbos?