If something goes ballistic, it suddenly becomes very much greater or more powerful, often in a surprising or unwanted way. August registrations have gone ballistic, accounting now for a quarter of the annual total. = mushroom. go ballistic to suddenly become very angry (ballistic (18-21 centuries), from ballista , from , from ballein )
relating to or characteristic of the motion of objects moving under their own momentum and the force of gravity; "ballistic missile"