To boogie or dance and usually jump enthusiastically around whilst listening to J-Pop or Japanese pop music.
Usually includes the dancer singing what little of the Japanese lyrics they know along with the song, and inevitably singing the English the artist includes as it's the only part they honestly understand.
Though J-Popping is mostly done by Japanese fangirls (though who love everything Japanese, purely because it's Japanese), it is also done by anyone with a passion for happy, energetic music.
When a man puts his hand in a girls mouth, and shakes it and runs the track at the same time, while having his skinny wang out. On the track he runs like the j, half way around, and the (Mind) represents the girl saying do you mind!