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1 definition by Nyancat•

 
1.
From the popular video "Nyan Cat".

Usually used numerous times in comments on YouTube videos, especially on the "Nyan Cat" video.
Person #1 OMG! LOL =D
Person #2 NYAN NYAN NYAN NYAN NYAN NYAN NYAN
by Nyancat• August 21, 2011