A term used to indicate that you will be "right here waiting" for someone. It references Richard Marx's hit ballad "Right Here Waiting", released in 1989.
Sally: I just have to run into the mall to buy a birthday present for my sister.
Blake: Take your time. I'll be Richard Marxing in the car.
Sally: Oh Blake, you're such a patient boyfriend. I'm so lucky to have you in my life.