*Going postal, in American English slang, means becoming extremely and uncontrollably angry, often to the point of violence, and usually in a workplace environment. Though the movie about the same thing says their Wikipedia research claims going postal describes a person who commits murder, mass murder or goes on a killing spree (isn't that all murder? Bless the redundant for they know not what they know.) Typically in the workplace. Generally with a firearm and usually by a former or current...
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