Go-postal definition

(intransitive, chiefly US, informal) To behave in a hysterical, angry or irrational manner.
verb
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Origin of go-postal

  • go (in the sense "become") + postal; from a rash of incidents, mostly gun violence, perpetrated by disgruntled U.S. Postal Service workers on co-workers in the United States, beginning in the 1980s (see quotations)

    From Wiktionary