kally, n. — Green’s Dictionary of Slang

kally n.

[ety. unknown; ? link to cool adj. (6a) or Carib.E coolie weed, a variety of fern and thus a play on weed n.¹ (1d); note also cooly n.]

(W.I. Rasta) marijuana.

1974		L. Kwesi Johnson ‘Five Nights of Bleeding’ in Voices of the Living Dead (1983) 31: It was a night named friday / when everyone was high on brew / or drew a pound or two worth of kally.
1980		L. Kwesi Johnson ‘It Noh Funny’ in Inglan Is A Bitch 11: Dem wi’ tek chance / fi get a likkle kally.