Pit Bull
From Futurepedia, the Back to the Future Wiki
The Pit Bull was a model of rocket-powered hoverboard that was used to make extremely fast trips. Unlike most other hoverboards which had to be pushed with one foot on or near the ground, its two directable rockets provided enough power for travel over water. It also had three tow cables that allowed additional hoverboarders to be towed behind the main unit.
Griff Tannen was a known owner of one, but after his arrest, it came into the possession of a little girl, who in turn gave Marty McFly her Mattel hoverboard.
