Green’s Dictionary of Slang

majonda n.

[? Filipino majonda, old, obsolete, although this image seems unlikely]

(US drugs) heroin.

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[US]Goldin et al. DAUL 133/1: Majonda. Narcotics.
[US]S.N. Pradhan Drug Abuse.
[US]Bentley & Corbett Prison Sl. 70: Horse also Shag and Stuff Heroin […] (Archaic: H, majonda).