Green’s Dictionary of Slang

wanga gut n.

[? wonga n. + SE gut, i.e. one is ‘hungry’ for cash]

(W.I./UK black teen) greediness or jealousy.

[WI]L.E. Adams Jam. Patois 63: Wanga-gut: hungry-belly.
[WI]Francis-Jackson Official Dancehall Dict. 54: Wanga-gut greedy; gluttonous: u. ’im’ is a wanga-gut.