I chose "tee-tee" as my potty word. It's not a term that is commonly used up here. I didn't use "hurry up", because for me that is a phrase I use frequently during my daily life. Calling out the dog's potty word in the house would have resulted in a confused dog, and possibly an accident that would have been MY fault.
That's just me. I try to keep things simple and easy for the dogs.