1 definition by Dr. River Song
A large serpent bearing resemblance to a penis, often depicted swimming. Commonly drawn in school related materials by more "creative" male classmates. First recorded sighting in a homework planner in 2013.
Student 1: "What the hell is that in my book? Does it have a scrotum for a tail?"
Student 2: "It's just a drawing of the Cockness Monster."
Student 2: "It's just a drawing of the Cockness Monster."
by Dr. River Song January 17, 2015