The term "Twin Turbo" refers to a type of engine setup where there are two separate turbochargers used to boost the power output of an internal combustion engine. Typically, one turbocharger is used for each cylinder bank in the engine, with each turbocharger providing forced air into its respective side of the engine. This allows for more efficient and effective use of exhaust gases from the engine to drive the turbochargers, resulting in increased power output and improved performance compared to a single-turbo setup.