Green’s Dictionary of Slang

moragrifa n.

also mor a grifa
[? Sp.; ult. greefo n.]

(drugs) marijuana.

[UK]J.B. Williams Narcotics and Hallucinogens.
[US]Illinois Legislative Investigating Committee Drug Crisis in Spears (1986).
[US]S.N. Pradhan Drug Abuse.
[US]ONDCP Street Terms 15: Mor a grifa — Marijuana.