Usually, this term means a small area off of a hall that is filled with lockers. This area is usually crowded, smally, and on the first floor of a school. A nibbin can also be a beautiful fairy creature, a young child, or something to do with movies.
"Mary, can I please put my stuff in your locker cause mine is in the nibbin and i don't want to go there."
by nESPO October 23, 2005
Third nipple
A: "That looks like a third nipple on your chest. What is it?"

B: "That's my nibbin."

A: "Mmm, sexy!"
by Lemonade30 April 28, 2011
pal or friend; usually in an embarrassingly endearing manner.
"Yo, you and Josh are my nibbins".
by meowmixalot November 12, 2008

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