Someone who eats a whole lot of food all the time, but never gains any wait. A nibbo does not have an eating disorder.
Rena- "Hey man. I just gobbled down another 3 bags of potato chips."
Tom- "Dang girl! You do that every week and gain no weight! Are you a nibbo!?"
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Boon Choon, the nibbo, caused Alween's hole to be sore for a week.
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Nimrod Nibbo is an intelligent name for a simple person, Somone that can take a ribbing but is a absolute clutz. Often a young person that resembles an old man in their behaviour and use of language. See nibbo nimrod knib
That boy Nick was a total Nimrod Nibbo,
“I thought he sounded like a 70 year old man”