manjack noun3 •Various plants in the genus Cordia.Buck Island's uplands forest cover also includes frangipani, turpentine, Jamaican caper, manjack, Ginger Thomas, and water mampoo trees. — 2002 •(Caribbean) A person; the average or common person; anybody.Manjack see her and stagger, and as if to justify he staggering, he lean over to me and whisper: "Let we fire some rum." I tell he let we get pass the introductions first. — 1990 •A form of bitumen-rich asphalt found in Barbados and Trinidad.In outward form and general appearance manjack is not unlike fine coal and is essentially a bituminous substance. — 1915 formsmanjacks