Green’s Dictionary of Slang

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

1965		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.
1968		‘Sl. of Watts’ in Current Sl. III:2 8: Acapulco, n. Best grade of marijuana.
1968		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.
1976		R. Sabbag Snowblind (1978) 38: You went from Michoacàn to Acapulco Gold and then to Panama Red.
1980		E. Folb Runnin’ Down Some Lines 170: Stronger mixtures like [...] Acapulco gold, Mexican green.
1990		(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.
1999		T. Dorsey Florida Roadkill 33: The best drugs from four counties: [...] Acapulco Gold, blue cheer, orange sunshine.
2002		E. Damerson in Dusted Mag. at Trikont.com 🌐 Pie-eyed neophytes occasionally found themselves more paranoid than they’d planned on as they gingerly embraced Acapulco Gold.
2012		T. Piccirilli Last Kind Words 27: Sitting on the hood of a ’66 Mustang, holding in a lungful of Acapulco Gold.