There's a site, http://ask.yahoo.com/ask/20021001.html, that talks about the term Dixie giving three explanations of where that term came from. The one I had heard had to do with the political "Mason-Dixon" Line that divided the states that formed the Confederate States of America during our Civil War from the Northern States. Those south of the line were called, "Dixie." Anyway, you might check out that site for more information.

Chicks, of course, is a slang expression for girls.