I hope you don't mind if I take a stab at this question my sister-sorors of AKA.
I think that folks used to say "good hair" when they meant a person whose hair was either naturally curly or straight without using chemicals. Clearly, during the house vs. field slave debacle (which many would say is still alive and kicking today, sadly), having "good hair" i.e. usually, but not always, indicated a racial mixture of African and XYZ (often slave master white), which was apparently preferable for most house slaves.
Although this phrase and its resultant definitions should be as archaic as Jim Crow laws, unfortunately folks sometimes still use this term when comparing naturally straight or curly hair to naturally kinky or textured hair. I never, ever use this term when describing anyone’s hair. My boyfriend has naturally curly hair: I say he has curly hair—never “good” hair.
Hope this helps a bit.
Shela.
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Finer Womanhood: the "Cat's Meow" Since 1920
[This message has been edited by Shelacious (edited October 23, 2000).]