Come on, D's!

Daniel and Joseph were playing with Joseph's ipad the other morning. Daniel knows that the screen has a "lock" on it. You have to type in a four-digit code to open it. Daniel understands that you have to type something in to unlock the screen. He was typing and typing to try to get it open. He started talking to himself, saying, "Come on, D's!" (like, come on, I'm typing my letter, now let me in!)