- The Bi-directional Unified Transit Terminal is an Isaac Sumdac invention from the Animated continuity family via Timelines fiction.
It operates by putting a crack in space.
Bee in the City
Professor Sumdac introduced his BUTT to Sari, Bumblebee and Optimus Prime one day, touting it as a way to get the Autobots home, and it certainly got "to the bottom of [their] transportation problem", as Optimus Prime put it. Everyone, except for possibly Sumdac himself, became aware of the acronym and spent several minutes squeezing jokes into their conversation about it. Unfortunately, it malfunctioned and transported Sari, Bumblebee, and Prime to Axiom Nexus.