Loading your ball-sack with your own pee, and releasing it on a girl.

*Takes skill and should not be performed by amateurs.

Step 1. Roll your wiener up into itself.
Step 2. Pull up your ball-sack over your remaining penis, until it forms the shape of a round balloon.
Step 3. Begin peeing until ball-sack fills with pee.
Step 4. When ball-sack is full, release on woman.