When a man drops his handful of genitalia on an unsuspecting person's back, usually when the other person is bent over or lying down. Then the man must sing, "Borty, borty, borty!" like the Swedish Chef.
A fine gentleman is taking a romantic shower with his loving wife, when he "accidentally" drops his shampoo bottle. The wife does what any loving person would do: she picks it up. Then the man drops his balls and cock on her back and sings like the Swedish Chef, "Borty, borty, borty!" She has then been given her official Swedish Backpack.