for a usually rocket powered, predominantly non-glide projectile or aerial vehicle, such as a ballistic missile, to travel to its target partly via unpowered ballistic or quasi-ballistic flight, usually following burnout of its rocket motor
for a powered, usually guided missile or other aerial vehicle to travel on an unguided or ballistic trajectory, having lost power, control or guidance
To become very angry and irrational.
The guy went ballistic when I tried to tell him he couldn't return the socks if the package had been opened.