The chocolate river involves a girl eating a mass amount of taco bell, and then having vaginal sex from behind. During which she suprises him by unloading all of her diarrea onto the mans stomach, hips, and of course his genitals, making a sort of river from her anus.

1: Willy Wonka's magical river made of pure, home grown chocolate, running right through the heart of the Wonka Factory.

2: Your Rectum