The practice, behavior, or philosophy of acting foolishly; foolishness or silliness as a habitual or systematic characteristic; the quality of being a booby.
From 'booby' (fool) plus the suffix '-ism' (denoting a practice, system, or characteristic). The '-ism' suffix creates an abstract noun describing a way of being or system of thought.
The '-ism' suffix turns almost anything into an ideology or system—we have capitalism, nationalism, and even boobyism! It's English's way of saying 'this is how things work in this system'!
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