Green’s Dictionary of Slang

Acapulco (gold) n.

[the drug derives in and around Acapulco de Juárez, in Guerrero state on the west coast of Mexico]

(orig. US drugs) a high-strength grade of marijuana.

Marijuana Newsletter No.1 30 Jan. in Lingeman (1969) n.p.: Acapulco gold. This is a special grade of pot growing only in the vicinity of Acapulco. The color is either brownish gold or a mixture of gold and green.
[US] ‘Sl. of Watts’ in Current Sl. III:2 8: Acapulco, n. Best grade of marijuana.
[US]T. Wolfe Electric Kool-Aid Acid Test (1969) 397: Acapulco Gold! Oh shit, we’re esoteric heads and we know the creamiest of all the marjuana.
[US]R. Sabbag Snowblind (1978) 38: You went from Michoacàn to Acapulco Gold and then to Panama Red.
[US]E. Folb Runnin’ Down Some Lines 170: Stronger mixtures like [...] Acapulco gold, Mexican green.
[US](con. c.1970) G. Hasford Phantom Blooper 22: Down in the French Quarter they scored about one ton of Acapulco Gold from some black jazz musicians.
[US]T. Dorsey Florida Roadkill 33: The best drugs from four counties: [...] Acapulco Gold, blue cheer, orange sunshine.
E. Damerson in Dusted Mag. at Trikont.com [Internet] Pie-eyed neophytes occasionally found themselves more paranoid than they’d planned on as they gingerly embraced Acapulco Gold.