Hi-daddy is/was also a type of flying switch where you would kick a car uphill, scoot the loco into the clear, and allow the car to roll back downhill past the switch. Kind of like rolling them by, except you didn't bother to tie the car down, cut the power off, get in the clear, THEN release the brake. You just sent it up the hill and hoped you had time to do what you needed before gravity did its thing. Certainly not in today's rule books but yes, I've done it.
Probably that was related to UP's post - on get-away day when you're going for a quit, you might do a hi-daddy to save time and get done quicker.