The act of defecating inside the water tank of a toilet.
Step 1: Go to the home of your mortal enemy. Ask to use the bathroom.
Step 2: Approach toilet and remove the water tank
lid.
Step 3: Step on the sides of the toilet and squat over the water. Carefully take a massive dump. Wipe your ass and dispose of toilet paper in the trash bin.
Step 4: Place water tank
lid back on the toilet.
Step
5: Escape.
What happens? With each resulting flush, it
will fill the
bowl with a chunky brown water. Its the gift that keeps on giving :)