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Used when an ass is visibly fat without using yogas.
"Look at that ass Tim, she got the ney ney's on!"
by YoungGabesAlot October 06, 2013
A psuedo-affectionate pet name for Neytiri, the female lead in the movie Avatar. Used tongue-in-cheek to mock obsessive fans, or those with a fetish for the aliens from said movie.
You have a gigabyte of na'vi porn? Awww, that's so sweet. Is Ney Ney your waifu]?
by Yue Fairchild January 25, 2011
The goddess of being a psuedo-lesbian and looking adorable while doing it.
"Ney Ney rocks my socks."

"Dude, did you hear? Ney Ney won the lottery!"
by Hey Zeus May 09, 2005