And the authoritative word on nitty-gritty.

On the other hand, it's not beyond the bounds of plausibility that some people are using "good egg" as rhyming slang, though at a remove: "good egg" is obviously the obverse of "bad egg", and means "honest reliable person", while "egg and spoon" (which is a new one one me, I have to confess) is not related to it. Very confusing: call a spade a spade, I say.

Steve

P.S. Apologies--I couldn't resist it! If you're not happy, I think I can make a good case thet the ironic use of slang expressions is not racist, unless it was intended to be.