macca, adj.¹ — Green’s Dictionary of Slang

macca adj.¹

[W.I. dial. macca, a thorn, thus cognate with sharp adj. (2)]

(W.I.) exceptionally good.

1995

Francis-Jackson Official Dancehall Dict. 32: Macca [...] 2. wickedly good: u. de ting macca.

macca-man (n.) [but note mackman under mack n.²]

(W.I.) a tough, strong, efficient man.

1980

Cassidy & LePage Dict. Jam. Eng. (2nd edn).