All hell broke loose
Definition 1 of 1
Pro Tip 1/3Idiomatic Usage
Used to describe a sudden, intense situation - often negative or involving conflict. 
When the verdict was read, all hell broke loose in the courtroom.
Pro Tip 2/3Figurative Sense
This phrase is not about real hell; it's used to give a strong image of disorder. 
When the fire alarm sounded, all hell broke loose as everyone scrambled to exit.
Pro Tip 3/3Informal Context
Most appropriate in casual conversation or artistic expressions, not formal situations. 
After the last-minute goal, all hell broke loose among the fans.