Green’s Dictionary of Slang

1. (Aus. prison) heroin.

1990

Tupper & Wortley Aus. Prison Sl. Gloss. 🌐 Petrol. Heroin.

2. (Aus.) energy, stamina.

1996

J. Byrell Lairs, Urgers & Coat-Tuggers 130: [T]hen he realised the old champ still had a lot of petrol left in the old tank and so he started riding him right out.

3. (N.Z. prison) liquid argactil.

2001

D. Looser Boobslang [U. Canterbury D.Phil. thesis] 139/1: petrol n. largactil juice.