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1.
Mid-west country-folk (see hilljack) slang for nosy or prying. (Gladys Kravitz syndrom from _Bewitched_)
Every time I pull in my girlfriend's driveway, I see that nibby neighbor of hers lookin' out her window.
by danw December 22, 2003
 
2.
Generic term for Cat treats; More specifically Pounce brand moist treats
We feed our cats nibbies on Caturday. Our cats like moist Nibbies better than the crunchy ones.
by hurrrrr derp derp August 31, 2010
 
3.
A small sexual organ, aka a small penis.
Mike Piquet in Nibby's Gone Wild.

I'm allergic to the bar tender. Every time I see her my nibby swells up.
by Mike Piquet March 07, 2008