Butters' Creamy Goo

Butters' Creamy Goo was an athletic enhancement that was featured in the Season Sixteen episode, "Sarcastaball".

Background
When Cartman desperately asked for Butters' help to become a better Sarcastaball player, Butters showed him a closet filled of jars of his "creamy goo", which was, in reality, the semen from his nocturnal emissions. Cartman ingested a jar of the "creamy goo", and believed that it made him feel better. This method soon became popular among other team players. As its popularity increased, a sports drink named Butters' Creamy Goo was commercialized using all the money from cancer (and any other terminal diseases) research.

At the end, Stan offers the drink to Randy Marsh, to help him realize Sarcastaball could be played sincerely. After drinking it, Randy immediately finds out that the drink is actually semen. As a result, Butters is grounded for selling his semen to other people.