Green’s Dictionary of Slang

(W.I. Rasta) I, me, mine.

1980		(con. 1950s) M. Thelwell Harder They Come 205: Most of the youth coming up were growing their locks and taking African names [...] talking about I-man dis an’ I-man de other.
1986		R. Hewitt White Talk Black Talk 109: Fe I-man never do not’n, na check wi’ dem fibes der, ya know.
2004		A. Mansbach ‘Crown Heist’ in Brooklyn Noir 126: I man nah fear no likkle pickney.