Green’s Dictionary of Slang

1. (orig. Aus.) Indonesia; an Indonesian; also as adj.

1954		B. Jeffrey White Coolies (1959) 137: She dressed herself quickly and went off with it to the Indos in Hut 11.
1966		Baker Aus. Lang. (2nd edn) 368: Indo, Indonesia(n). This word was mainly used by Australia’s ‘yellow Press’, beginning in 1958, to fit headings. After a flirtation with it, the Melbourne ‘Sun-Pictorial’ converted it to Indon.
1978		C.J. Koch Year of Living Dangerously 36: The Indos don’t take much notice of me – they think I’m a local. [Ibid.] 61: The Indo. newspapers are always running articles on the white men’s vice den here.

2. (drugs) marijuana.

1992		Tracks (Aus.) Oct. 131: Indo is also in the midst of its off season, but [...] if you get up early to beat the winds you will still score excellent waves.
1993		Dr Dre ‘Day The Niggaz Took Over’ 🎵 I ain’t no dead do’, I’m high off the indo.
2000		Ebonics Primer at www.dolemite.com 🌐 indo Definition: premium marijuana grown indoors Example: I smokes nuthin but the finest indo, straight butta baby!
2002		‘Touré’ Portable Promised Land (ms.) 155: We Words (My Favorite Things) [...] Boom. Buddha. Reefer. Ism. Indo. Lah. Trees.

3. see indoor n.