book (on) out
To leave a location very quickly. He booked on out the back door as soon as he saw his ex-girlfriend walk into the party. I booked out of the house when I realized that I was going to be late for my appointment.
book (on) out
Sl. to leave in a hurry; to depart very suddenly and rapidly. I'm in a hurry, so I've got to book out right now. Let's book on out of this place as soon as we can.