One of Dr. Alphonse Mephesto's most prized creations, the four-assed monkey was engineered after the loss of Evil Clone Stan for the South Park Elementary science fair. Presented by Terrance Mephesto it was projected to change science forever... unfortunately, it failed to impress Mr. Garrison, losing out to Fluffy's half-human offspring. It now resides at the Genetic Engineering Ranch, living out it's days in peace with other multi-assed creatures.
You’re an enigma. You may be a little irritable, which could be due in part to the fact that a lot of your life is out of your control. People with Four-Assed Monkey DNA prefer a life of peace and quiet, and hope to settle down somewhere with others like them.
- An Elephant Makes Love to a Pig (s01e05)