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It is the action to describe what Vtuber Nanashi Mumei does, but this action is the absence of expectations, and the presence of surprises, essentially it forms the essence of what Mumei does, hence she is mooming. In other words, it is to describe the horrific or silly actions which may happen under Mumei's actions. Related ways to spell the word is: - mooming - moom (singular representing the vtuber herself) - mooms (possessive form)
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