Green’s Dictionary of Slang

goom n.1

[? Jagara goom, water]

(Aus.) methylated spirits, as an alcoholic’s drink.

[Aus] ‘Whisper All Aussie Dict.’ in Kings Cross Whisper (Sydney) xxxv 6/1: goom: Methylated Spirits.
[Aus]R. Aven-Bray Ridgey-Didge Oz Jack Lang 29: Goom Methylated spirit.
[Aus]Tupper & Wortley Aus. Prison Sl. Gloss. [Internet] Goom. Alcoholic ‘brew’, particularly one containing methylated spirits; an aboriginal term.