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

1.
mengamuk, naik gila
to become extremely and uncontrollably angry, often to the point of violence
:
•
After getting fired, he threatened to go postal on his former boss.
Selepas dipecat, dia mengancam untuk mengamuk terhadap bekas bosnya.
•
The customer started to go postal when his order was incorrect for the third time.
Pelanggan mula mengamuk apabila pesanannya salah untuk kali ketiga.