go postal

: to move on a course : proceed — compare stop

: to move out of or away from a place expressed or implied : leave, depart

: to take a certain course or follow a certain procedure

: the act or manner of going

: the height of fashion : rage

: an often unexpected turn of affairs : occurrence

: functioning properly : being in good and ready condition

: a game played between two players who alternately place black and white stones on a board checkered by 19 vertical lines and 19 horizontal lines in an attempt to enclose the larger area on the board

: of or relating to the mails or the post office

: conducted by mail

: insanely or murderously violent