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originally coined from a series of real life shootings in the postal service, it now usually means that someone is about to go nuts or off the deep end. the reason for going postal is usually trivial. also, means person on psychiatric meds that is off their pills.
after finding her computer's wallpaper had been changed again, Jane went postal on her fellow workers.
by Foozi100 July 23, 2005
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When someone gets uncontrollably angry, often to a point of violence, usually in a workplace
After finding out Mark had another hour added to his 4 hour mail delivery shift, He brought a gun into work the next day and was reportedly going postal on fellow workers and customers
by NickBaggss March 04, 2016
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Basicly, "going postal" is pulling a uzi, assault rifle or most any other firearm out from under your jacket and going nuts. That is, wasting anyone and anything you see, and then probably yourself. A bit like going apeshit.
Jim had left another burning paper bag of crap on John's doorstep, so John retaliated by going postal on his ass.
by Johnny The Homicidal Maniac August 19, 2004
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When somebody gets really pissed and acts out in violence. They might push someone's head through a wall.
Addison is going postal and she is about to throw a punch at Timmy.
by mcnuggetdestroyer January 03, 2018
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When you can't afford buying something you really want, and pitch a fit.
Alicia's broke, so she's going postal again....
by Emmi-chan June 17, 2005
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