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A portmanteau of 'Man' and 'Tantrum' that describes a man losing his temper. The term is inherently derogatory as the term 'tantrum' is most often used to describe an irrational or selfish anger, typical of infants. The term is often used by those who wish to undermine someone of the opposite gender by use of a sexist remark, analogous to a man claiming that a woman is "on her period" or "having their time of the month" when they are distressed.
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