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A particularly foul belly button odor typical of overweight and under showered people. It's a form of fromunda cheese.
"I stuck my finger in her smellybutton on accident and couldn't pick my nose for a month.
by MAXTAXIN March 20, 2017
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2
A bellybutton that smells. What the hell else would it mean?
Stuck my finger in my bellybutton this morning. That shit stinks. I've got a smellybutton, son.
by A Nice Chunk of Bernice June 22, 2010
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