A fork of Rural Dictionary
Becoming fully, truly, unstoppably, gravitationally angry. Usually of a person or semi-sentient animal that can experience anger. References ballistic missiles, whose flight paths are nearly un-alterable after a certain point.
"When dad finds out I didn't submit my college applications, he'll be going ballistic!"
Get very angry, such that you lose your self-control.
I wouldn't start by telling her that you actually slept with Rachel. She'd go ballistic and you'd never be able to explain the rest.
Getting so angry that you literally launch yourself up like a ballistic missile
Wesley: Hey man, how's John doing now? William: I don't think he's alright, he's going ballistic after his girlfriend left him.