Green’s Dictionary of Slang

(US drugs) to buy narcotics.

1936		D. Maurer ‘Argot of the Und. Narcotic Addict’ Pt 1 in AS XI:2 124/1: mizake the mizan. To score a connection and buy dope from a peddler. Perhaps a corruption of the phrase ‘make the man.’.
1959		J.E. Schmidt Narcotics Lingo and Lore.