Whatchoo gonna do?

My Genny has a catchphrase: "Whatchoo gonna do?"
She says this about 100 times a day, and it's usually "Whatchoo gonna do, Mommy?" or "Whatchoo gonna do, Daddy?" In the car, in the house, all day, every day. Every occasion, and repeated over and over and over and over.... well, you get the picture.

It was sort of cute (albeit puzzling) at first, and now it has descended into the realm of annoying. I have no idea where she picked it up, but I expect that one of these days, someone around us will innocently ask "whatchoo gonna do?" and I will have to punch them in the face.