Go off on one
Definition 1 of 1
Pro Tip 1/3Intensity Warning
Indicates a strong, often sudden emotional response that can seem overwhelming. 
He's calm now, but mention the unfair penalty and he might go off on one.
Pro Tip 2/3Colloquial Term
Used in casual conversation, not suitable for formal situations. 
In a professional meeting, avoid saying she 'went off on one'.
Pro Tip 3/3British Slang
Primarily used in the UK, might not be understood or used by English speakers from other regions. 
I was confused when my British friend said his boss 'went off on one'.