While having sex from behind one quickly removes there penis and forcibly rams it into the girls ass. This must be done with total Jersey attitude. Before the switch You must throw up your right arm in an attempt to signal the change that is coming. This is not to be confused with the "Oopsy daisy" which has no turn signal and does not require a douche bag attitude.
(Note: A skilled person should be able to preform this maneuver in any position.)
"Why did Cassie call out sick?"
"You didn't hear? Mike pulled a Jersey Swoop on her last night. She wont be walking straight for a week."