Green’s Dictionary of Slang

(drugs) marijuana; thus bambalacha rancher/rambler, a marijuana smoker.

1938		R.P. Walton Marihuana.
1959		J.E. Schmidt Narcotics Lingo and Lore 9: Bambalacha – the narcotic hashish [...] Bambalacha rambler – A smoker of marihuana cigarettes.
1963		L.F. Freed Crime in S. Afr. 102: All of them were addicted to dagga or ‘bambalacha’, as they called it.
2001		Daily Tel. (London) 30 Jan. n.p.: May I interest you in some Aunt Mary? Or perhaps a little baby bhang? No, I can see, you prefer El Diablito. Or bambalacha?
2001		ONDCP Street Terms 2: Bamba — Marijuana.