Green’s Dictionary of Slang

(orig. Aus.) drunk.

1905		Sun. Times (Perth) 27 Aug. 4/7: They say they never will forget the last time you came through— / You turned the whole town upside down and made us inky-poo.
1907		Lone Hand (Sydney) Sept. 534/2: Jimmy, who is a drefful temperate bloke, stipulated that there was to be no getting inky.
1919		Aussie (France) 13 Apr. 1/1: The Offsider always had his thumb tied up with a thick bandage, and before the job was over he was usually a bit inky, but the boss didn’t tumble to it.
1924		E.G. Murphy ‘Mrs. Flanagan’s Frock’ Dryblower’s Verses 70: Its shandy-gaff staff lifted inky hoorays / When the camels came in with the monthly supply.
1945		Baker Aus. Lang. 166: A man who is drunk is said to be [...] inked, inkypoo [...].
1955		A.W. Upfield Cake in Hat Box 5: ‘Doc in town?’ asked Silas of the licensee. ‘Yes, but he’s inky-poo. Be out to it till morning.’.
1965		R. Fair Treasury Anzac Humour 38: Well, he . . was very particular about the rum issue... The offsider . . was usually a bit inky [AND].