@dragonmagic it's not exactly unique, while it's a much more "crude" example: calling something "shit" is clearly expressing disgust or extreme dislike towards that thing, but saying something is " *the* shit" generally means one is calling that thing particularly good.
As far as the salt goes, Id assumed salt of the earth simply referred to rock salt os such being valuable, but wikipedia seems to suggest it's religious in origin? Like, "you improve the earth like salt improves food", I guess?
@CarbonIceDragon huh, that's pretty interesting, I appreciate the research and thought put into this reply