"Pop" is what people from Michigan, Minnesota, and Washington use to denote "soda."
Washingtonian: Is there a pop machine in this venue? I am truly parched.
Californian: "Pot machine?" When did they begin the enterprise of vending the cannabis?
Washingtonian: No, good sir. I requested a "pop" machine.
Californian: Is "pop" some other form of illegal or illicit substance?
Washingtonian: No, bloke. Look here: "pop" as in a soft drink--such as a cola beverage, for example.
Californian: Ho! You desire to beseech a "soda."
Washingtonian: It's "pop," damnit. "Pop."