Or
# The most common explanation for the origin of this phrase is that it is from corncracker, or someone who distills corn whiskey (cracking corn is to crush it into a mash for distillation). The song lyric 'Jimmy Crack Corn' is a reference to this. In the song a slave sings about his master got drunk, fell, hit his head, and died. And the slave 'don't care.' The usage, however, is probably not the origin of the term cracker.
phobos.ramapo.edu/~pchang/etymology_of_hate.htm
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Fri 5 Sep 2003, 12:42,
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phobos.ramapo.edu/~pchang/etymology_of_hate.htm