Chinese Rattlesnake
When one puts rice in a balloon, blows it up, and inserts it into another's rectal cavity. The person inserts his or her penis or finger into the rectal cavity, and shakes vigorously, rattling the rice within similarly to the way a rattlesnake rattles its tail. Once finished, kick the partner in the stomach, successfully ejecting the now pressure cooked rice.
Yo, my stove broke down, so Jane and I had to Chinese Rattlesnake it last night.