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

1.
격분하다, 미쳐 날뛰다
to become extremely and uncontrollably angry, often to the point of violence
:
•
After getting fired, he threatened to go postal on his former boss.
해고된 후, 그는 전 상사에게 격분할 것이라고 위협했다.
•
The customer started to go postal when his order was incorrect for the third time.
주문이 세 번째로 틀리자 고객은 격분하기 시작했다.