Meaning of the word "go postal" in English

What does "go postal" mean in English? Explore the meaning, pronunciation, and specific usage of this word with Lingoland.

go postal

US /ɡoʊ ˈpoʊ.stəl/
UK /ɡəʊ ˈpəʊ.stəl/
"go postal" picture

Idiom

to become extremely and uncontrollably angry, often to the point of violence

Example:
After getting fired, he threatened to go postal on his former boss.
The customer started to go postal when his order was incorrect for the third time.