Green’s Dictionary of Slang

1. marijuana [abbr. bobo bush n.].

1959		J.E. Schmidt Narcotics Lingo and Lore.
2001		ONDCP Street Terms 4: Bo-bo — Marijuana.

2. crack cocaine [? bobo n.¹ (3), i.e. its whiteness].

1998		M.A. & E. D’Onofrio Psychiatric Words and Phrases 161: bobo (crack).
2002		T. Nordegren A-Z Encyc. of Alcohol and Drug Abuse 128/1: Bobo [...] 3. Colloquial term for crack.