Okay, I have lived in Mississippi 99% of my lifetime, and I still don't understand the "coke" thing. Yes, if someone asks what I want to drink, I say "coke," but simply because I really want a coke. I rarely refer to it as anything, but if I do, I call it a soda. More often, just a drink. If it is coming from a fast food establishment or something, people know I mean "soda."