fluxy, adj. — Green’s Dictionary of Slang

fluxy adj.

[orig. used of under-ripe or blemished mangoes]

(W.I.) superficially impressive.

1970s		T. Rhone Gloss. in Old Story Time (1981) n.p.: fluxy: flawless on outside but rotten inside.
1995		Francis-Jackson Official Dancehall Dict. 20: Fluxy immature; having loose body fat; (of people, fruits): u. fluxy bwoy.