noun
a blend of the words 'man' and 'tantrum', used to describe an adult behaving in a childish or tantrum-like manner
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The CEO threw a mantrum when he found out about the decrease in quarterly profits.
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My dad always has a mantrum when his favorite sports team loses a game.
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Stop having a mantrum and just deal with it.
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Her mantrum was like a storm, loud and intense but quickly passing.