Green’s Dictionary of Slang

kaya n.

[orig. Jam. use; ety. unknown; ? link to Carib.E. kayakiit, a form of medicinal herb, thus note herb n.¹ (1)]

(drugs) marijuana.

1982		in J.A. Holm Dict. Bahamian Eng.
2001		ONDCP Street Terms 13: Kaya — Marijuana.