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Naisi is when you mash the words NICE and Ee together. It means a person who smiles like a idiot, acts like a baby, and does stupid crap.
Naisi came into the room grinning like a fool and tripped over his own feet.
My cousin is a Naisi. He laughs at everything and eats cereal for dinner.
Naisi is the reason why my dog now thinks he's a human.