noun
a condition resulting from excessive consumption of caffeine, characterized by nervousness, irritability, restlessness, and insomnia
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Caffeinism is a condition that results from excessive consumption of caffeine.
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I think I might have caffeinism from drinking too much coffee.
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Dude, you need to cut back on the caffeine or you'll get caffeinism.
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His obsession with work had turned into a kind of caffeinism, always needing that extra boost to keep going.