Green’s Dictionary of Slang

1. (US) verve, zest.

1989

J. Tyman Inside Out: Autobiog. Native Canadian (1995) 133: I sat [...] and watched her getting ready for her octane boost. ‘How long have you been fixing?’ ‘Five, six years now.’ .

2. (drugs) phencyclidine laced with gasoline.

2001

ONDCP Street Terms 16: Octane — PCP laced with gasoline.