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verb. The act of going completely insane. verb. Going on a shooting spree at school. adj. Insane or deranged. adj. Violently angry. Obsoletes: Postal Gone crazy or insane; irrational. Usually observed anywhere there are large groups of students, i.e., on campus. Came into use after a student lost control of his mental faculties on Virginia Tech campus in Blacksburg, VA and went on a shooting spree, killing 32 and then killing himself.
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