The Boomobile is a character from the Pixcar movie, Monster Trucks, Inc. She is a young car that traveled to the other world of monster trucks, where she met Mike and Sulley. Sulley also calls her Boo in Cars: Mater-National Championship and Cars: Race-O-Rama.
The Boomobile is a parody of Boo from the Pixar film, Monsters, Inc.