The pieces oftoilet paper you drop into the bowl of an airplane toilet so the deposit you leave can land on it and go down the hole without leaving skid marks in the bowl for the next washroom user.
When you are having sex doggy-style at the top of a flight of stairs, and, right before you climax, you simultaneously thrust hard and pull the woman's arms out from under her and ride her down the stairs.
when having sex doggy-style at the top of the stairs, you swipe the arms out from underneath the woman, grab her arms and ride her down the stairs while remaining inserted