Big Butt Rock is a huge rock shaped like a butt featured in the episode "Thanks for the Crabapples, Giuseppe." The misfit wizards wanted to ride to Big Butt Rock and go on the Cheeks' Peak, where the various feelings and insights they gain from the journey will allow them to create a completely original spell, allowing them to form a new school of magic. At the end, they didn't manage to get to the rock and ended up in a swamp.
Big Butt Rock is a huge rock shaped like a butt. It is surrounded by a large forest.
- There may be other size butt rocks, as a Medium Butt Rock appears in Adventure Time: The Secret of the Nameless Kingdom.