Green’s Dictionary of Slang

(Aus.) drunk.

1907		Sun. Times (Perth) 31 Mar. 1/1: The recent marriage of a barmaid took the cake for cuddle [and] it was only a rumor that the bridgroom was molo.
1917		Truth (Melbourne) 18 Aug. 8/3: The young man referred to as having been on a ‘jag,’ was, to put it simply ‘molo,’ ‘sozzled,’ or ‘"inked up to the eyes’.
1923		Smith’s Wkly (Sydney) 11 Aug. 15/4: Me, Robbo, Darkie and Adelaide Jack was sitting in the bar when the possum blew in; ’arf molo.
1925		(con. WWI) Fraser & Gibbons Soldier and Sailor Words 157: Molo: Drunk.
1953		T.A.G. Hungerford Riverslake 186: It’s usually a good turn down at the Causeway, even if the blokes do get a bit molo and want to fight.
1972		A. Chipper Aussie Swearers Guide 52: Non-Aussies are sometimes surprised to hear that rotten is basic Australian for ‘drunk’. There is also a whole boozey flood of alternatives available, among them blithered, full as a goog, half-cut, molo and snockered.
1983		R. Aven-Bray Ridgey-Didge Oz Jack Lang 15: He was half molo when he jumped into a slapsie to go home.