go postal
US /ɡoʊ ˈpoʊ.stəl/
UK /ɡoʊ ˈpoʊ.stəl/

1.
大發雷霆, 發瘋
to become extremely and uncontrollably angry, often to the point of violence
:
•
After getting fired, he threatened to go postal on his former boss.
被解僱後,他威脅要對前老闆大發雷霆。
•
The customer started to go postal when his order was incorrect for the third time.
當他的訂單第三次出錯時,顧客開始大發雷霆。