From Dragon Ball Encyclopedia
The Devil's Toilet (魔神 の 便所, Majin no Benjo) is a dark and spooky room located within Uranai Baba's Palace.
 Dragon Ball
Two huge Devil statues made of stone faced each other (both sitting on toilets) in this room. The fight between Yamucha and Son Goku against Mummy and Devil Man took place on the very long and narrow tongues of these stone statues. There was also a pond full of a deadly, hot, acidic liquid below.
 Video games
The Devil's Toilet is named the Devil's Cauldron in Dragon Ball: Origins 2.
- The Two-Star Ball lands here and somehow ends up in two pieces in Dragon Ball Z: Attack of the Saiyans. It is guarded by two stone golems, Ladies and Gentlemen.