Green’s Dictionary of Slang

1. (drugs) crack cocaine and marijuana smoked together.

1993		E. Richards Cocaine True 79: I blow a lot of it smoking turbos.
2001		ONDCP Street Terms 21: Turbo — Marijuana and crack.

2. (US campus) a very energetic, ‘speedy’ person; as adj., slightly crazy.

1994		J. Wambaugh Finnegan’s Week 212: Kin we jist have our shooters, dude? Kin we do that without you goin turbo?
1997–2000		Da Bomb 🌐 30: Turbo; A person who moves or talks too quickly.