Green’s Dictionary of Slang

(Aus.) very drunk.

1911		Bulletin (Sydney) 12 Oct. 14/2: Who ever hears [...] of a man being ‘drunk’? [...] The staid and dignified citizen will say he is ‘intoxicated’ [...] the average boy that he is ‘shickered,’ ‘blithered’ or ‘tonicked.’.
1918		C.J. Dennis ‘Sore Throat’ in Backblock Ballads 59: Who fades and wilts an’ calls for nurse, / To hear a blithered soldier’s curse.
1924		(con. WWI) A.G. Pretty Gloss. of Sl. [...] in the A.I.F. 1921–1924 (rev. t/s) n.p.: blithered. Drunk.
1932		Narromine News (NSW) 22 July 6/3: He was full right up to the neck. He was so beautifully blithered that he wanted to fight a 15-stone Constable O’Groogy.
1944		A. Marshall These Are My People (1957) 72: We [...] gets a sky pilot, but he’s late and we’re all blithered when he turns up.
1967		J. Wynnum I’m a Jack, All Right 42: The only times any customers have been prepared to get stuck with them coloured needles has been when they are completely blithered.
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.
1982		N. Keesing Lily on the Dustbin 185: Several successive women instanced well-known general slang terms for drunkenness: ‘High as a kite’, ‘full as a boot’, ‘blithered’ and so on.
1999		G. Seal Lingo 134: The effects of our occasionally over-enthusiastic imbibing show a great variety of invention and colour, including: [...] the now, sadly, abandoned blithered.