SINCE 1828
black tar
noun
variants:
or black tar heroin
Medical Definition of black tar
slang
: a black or dark brown, often sticky form of heroin
The new heroin, which users call black tar because it resembles roofing tar in color and consistency, is increasingly dominating the nation's heroin markets.— Joel Brinkley, The New York Times, 28 Mar. 1986
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