Green’s Dictionary of Slang

fudgsicle n.

[proprietary name of the Fudgsicle ice-cream-bar, although the bar is, in fact, all-chocolate; the usual image in such terms, e.g. apple n.1 (1), Oreo (cookie) n., is of something that, while coloured outside, is white within]

(US) a black person who is criticized by other blacks for behaving in a ‘white’ manner.

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[US]Maledicta II:1+2 (Summer/Winter) 157: Fudgsicle A black person who behaves white: ‘Black on the outside, white on the inside.’ Actually, the trademarked Fudgsicle is all chocolate-colored, unlike the vanilla ice cream bar coated with chocolate.