What's wrong with POP? that's what it is around southwestern PA, too!
Here (Tennessee) everything is Coke, or called by it's name, never 'pop'. Just like ATV's are 4-wheelers not Quads.
When you go home after a few days on the trail "Up North" and you've adapted (slightly) to the lingo and order a 'pop' your so-called friends give you a realy hard time

I've sence then sought therapy, broken the habit and found my way back to my southern roots

Zig