Boom-Boom is a type of beverage served to pilots in the Terran Confederation. It is an extremely potent, powerful beverage that most people cannot stomach on the first shot.
During their service on the TCS Midway in 2681, Lance Casey was offered a shot of Boom-Boom by his cocky friend Maxwell "Meastro" Garrett in the bar of the Midway. Casey spat it out on the first try, but Maestro managed to finish it. It apparently takes one a few shots to adjust to its strong, possibly even terrible taste.