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4.
To loose touch with someone for a long time. Not talk to someone in a while.
You go postal on me all the time and I only hear from you every 3 months.
por Boopboop 03 de Junho de 2007
 
1.
To lash out violently and at random, often in a blind rage. Term taken from the 1990's incidents of workplace violence involving US Postal System workers.
I was so angry at work with the new workload, I was afraid I'd go postal.
por Unidyne 11 de Março de 2005
 
2.
To exact calculated revenge on co-workers or schoolmates, usually with a firearm, after being fired or expelled or just feeling extremely hard-done-by.

Software tester Michael McDermott shot and killed seven co-workers in 2000 after having his pay docked to cover back taxes.
A disgruntled former worker went postal today leaving seven dead, including two accountants he had accused of being 'Nazis' the day before.
por bee 22 de Março de 2005
 
3.
to succumb to fatigue and tension, to be become violently angry(from a series of incidents from the mid 80s to the 90s where various postal workers went on shooting rampages)
I will not let him go postal in plain sight.
por The Return of Light Joker 10 de Julho de 2008