のまのまイェイ
The "Numa Numa dance":https://en.wikipedia.org/wiki/Numa_Numa_(video), a 2004 internet meme spawned from the Romanian-language dance hit "Dragostea din Tei":http://en.wikipedia.org/wiki/Dragostea_din_tei by O-Zone.

Both in English and in Japanese, the lyrics were misheard as a mondegreen in those languages. The "lyrics" in Japanese can be found "here":[https://utaten.com/lyric/kz15032119/].
The chorus is misheard as "Drink, drink, yay!", so in Japanese will often be seen accompanied with people drinking alcohol.

Post #42977 was a popular flash animation of the Japanese version of the meme, illustrating the Japanese interpretation of the lyrics.

h4. External links:
* "Youtube (のまのまイェイ)":[https://www.youtube.com/watch?v=GtWCtIIsfeg]
numa numa (meme)