Green’s Dictionary of Slang

(drugs) marijuana grown in and exported from Hawaii.

1978		L. Kramer Faggots 301: Moroccan Hash, Red Lebanese, Black Afghani, Hawaiian, Kentucky Bluegrass.
1981		D.E. Miller Bk of Jargon 337: Hawaiian: High-potency marijuana grown in Hawaii.
1997		(con. 1970s) G. Pelecanos King Suckerman (1998) 54: he wouldn’t know Hawaiian from backyard ragweed.
2001		ONDCP Street Terms 11: Hawaiian — Very high potency marijuana.