Quote Originally Posted by Urban Dictionary
The correct term when referring to carbonated beverages.

Often mistakenly called "Coke", which is actually a specific type of soda, and "Pop," which is just sounds like nails on a chalk board.
Often elongated into "Soda Pop," which if you'll notice starts with "Soda," denoting its being the proper term.
Quote Originally Posted by The UD, again
The RIGHT word for a carbonated drink.

its not the 1940s anymore grandpa, we don't say pop anymore when we want a drink.
Urban Dictionary is the end of this debate.