Green’s Dictionary of Slang

(W.I.) a person who is superior in some way, either positively or negatively.

1983		C. Knight We Shall Not Die 45: Di big man dem must go. Di big blood-claat lan’ ginigog dem mus’ go. There is no place for dem. An’ as yuh say di first ting to do is to return di lan’ to di people.
2006		D.J. Reynolds Jabari Authentic Jam. Dict. 56/2: ginigog [...] n. – someone who acts like a ruffian; used as a rank or title, e.g. expert.