Every so often, I hear the voice of one of my college professors ringing in my ears. Dr Gallagher was one of my speech professors and a stickler for the English language. She had no tolerance for improper grammar. Dr G made me a much better communicator in my four short years under her tutelage. So, anytime I use slang, I think of her and how much she hated it. The other day, I was walking through the hallway at work and ran into one of my co-workers. And the same word came out of our mouths simultaneously: sup. It was at that moment I realized something…