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1.
Having a sexual fetish towards the human navel, usually called belly button in the fetish community.
"He , having a belly button fetish, became sexually aroused by the sight of her belly button"
by AbbyandMarc February 22, 2008
 
2.
the love or like of a belly button. many have this fetish and are sexually aroused by the sight of a navel or hearing someone say ''belly button'' or ''navel''.
"oh man, i have a huge belly button fetish"
by crazy-man July 27, 2008