Green’s Dictionary of Slang

abo n.

also Abo, Abor
[? abbr. of the column ‘Aboriginalities’, launched in the Sydney Bulletin, 15 Oct. 1887 (one regular writer for which signed himself ‘Abo’); AND suggests it was current orally somewhat earlier; the SE Aborigine and Aboriginal are found in 1829 citations; pl. Aborigines is found in 1803]

1. (Aus.) an Aboriginal.

implied in sense 2.
[Aus]Bulletin (Sydney) 2 July 22/2: None of the abos. dared let any other get hold of such awful powers; hence the charm, wearer and all, was indispensable.
[Aus]All Abaht It Nov. 10: We have a full-blood ‘Abor,’ / Throws the boomerang real well.
[Aus]Cairns Post 30 Sept. 5/1: [headline] Abo Found Drunk.
[Aus]K.S. Prichard Coonardoo 138: The abos are different – nicer than any I’ve ever seen before.
[Aus]F. Blakeley Hard Liberty 265: We let the Chinamen use bats, but the Abos had to play with round green sticks.
[Aus]L. Glassop We Were the Rats 5: He stopped the abo in three last Saturdee. What a punch! It was a bloody beaut.
[Aus]Cusack & James Come in Spinner (1960) 137: ‘Say, Guin, why don’t you live in a place with an elevator?’ ‘Garn. This house is a hundred years old.’ ‘Then it’s time they gave it back to the Abos.’.
[Aus]S. Gore Holy Smoke 67: Y’know the Abos reckon it was a frog that made the Flood, don’cha?
[Aus]K. Gilbert Living Black 225: Mum, one of those kids at school called me a black Abo.
[UK]B. Chatwin Songlines 76: Surely this country’s only good for Abos?
[UK]I. Welsh Filth 151: Same in New South Wales, Abos and pakis were fair game to us.
[Aus]M.B. ‘Chopper’ Read Chopper 4 81: She always said no to Abos and policemen.

2. attrib. use of sense 1.

[Aus]Bulletin (Sydney) 17 Jan. 14/2: [He] says Chinese extract the gall-juice of crows for physic. All Abo-shine.
[Aus]Cairns Post 30 Sept. 4/5: [headline] Abo Influenza Victims.
[NZ]‘Te Whare’ Bush Cinema 38: An ‘abo’ legend attaches to the great bluff between Bermagni and Tathra [OED].
[Aus]X. Herbert Capricornia (1939) 115: Who’s paying? [...] Abo Department?
[Aus]Townsville Daily Bulletin 17 June 3/8: We want more protection for the true aborigine, his native game and aboland.
[Aus]D. O’Grady A Bottle of Sandwiches 30: ‘What’s Luxor?’ ‘Abo baccy. Pretty potent, an’ a bit coarse.’.
[Aus]P. Temple Truth 277: ‘Sad boy, the Lovey Dovey,’ said Burgess. ‘Not a mixer. The Abo chip’.

3. (Aus.) an expert on Aborigine and bush customs and folktales.

[Aus]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.

In compounds

abo’s handbag (n.) (also abo’s briefcase, handbag)

(Aus.) any form of boxed (rather than bottled) wine.

Littlest Zobo 27 Sept. [Internet] Goon! Goon is what Aussies call really cheap wine boxes. The bag inside the winebox is also known as ‘Abo’s Handbag’ because it is very cheap and because when the Abo in question has emptied the bag, they can blow into it to inflate it. Voila: a pillow for sleeping in gutters.
Wikipedia [Internet] A box wine (also known as [...] handbag, Abo’s handbag [...] or Chateau Cardboard).
stebo taeblog 3 Jan. [blog] We [...] finished an Abo’s handbag of red Goon (it’s a wine ‘product’ which means the over or under ripe grapes enhanced with sugar).
R. Allinson I Come from a Land Down Under 23 Apr. [blog] I have found out numerous things that a didn’t know about goon. One that it is sometimes referred to as the Abo’s Briefcase or Abo’s Handbag depending on the gender of said Aboriginal.

In phrases

dark as an abo’s arsehole (adj.)

see under dark adj.