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

1.
volverse loco, perder los estribos
to become extremely and uncontrollably angry, often to the point of violence
:
•
After getting fired, he threatened to go postal on his former boss.
Después de ser despedido, amenazó con volverse loco con su antiguo jefe.
•
The customer started to go postal when his order was incorrect for the third time.
El cliente empezó a volverse loco cuando su pedido estaba incorrecto por tercera vez.