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A person who can be a guy or a girl depending on which one makes more trouble or laughs; named after Najimi Osana from Komi Can't Communicate, who acts like a confused mess.
'Najimi just walked in and decided to be a girl today. I don't know why, but I'm already annoyed.'
'He's a guy today, but I swear he was a girl yesterday. What even is he?'
'Najimi switched genders just to make me look bad in front of my friends. Pathetic.'