Green’s Dictionary of Slang

basuco n.

also basuko, bazuca, bazuco
[Colombian Sp., + ? links to Sp. bazucar, to shake violently or basura, waste, rubbish; a parallel ety. suggests the SE bazooka, with a ref. to the drug’s ‘explosive’ effect]

[1980s+] (drugs) coca paste, part of the process that produces cocaine, mixed with a variety of impure and poss. toxic substances, e.g. leaded gasoline, kerosene, sulphuric acid and potassium permanganate; smoking basuco as a ‘cigarette’ (mixing basuco either with tobacco or marijuana) is common in cocaine-producing countries.