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1.
means Breasts in Singapore.
you damm neh neh!
by nipplesUNited October 14, 2009
 
2.
used to show insignificance in one's speech or state of mind. It is in reference to one who is mentally handicapped. If some one says something unintelligent or replys to a question or answer with something unintelligent, the other person responds with "Neh Neh!"
Kid1: Im gonna go outside and shoot some ball

Kid2: hey. you know that its raining outside. that means you could get wet.

Kid1: Neh Neh!
by Lucchino August 20, 2007