flash blood
 n.— «Many injecting drug users share dirty needles or use a dangerous cash-saving technique known as “flash blood,” in which a user injects heroin or another illicit substance and then draws a syringe full of blood that is passed to a second user to inject.» —“Escalating drug use threatens AIDS fight” in Stone Town, Tanzania PlusNews Global July 27, 2007. (source: Double-Tongued Dictionary)

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