The song was played as a brief, recurring clip on a 15-year-old Japanese T.V. show called “Gachinko Fight Club.” The pirated show has been streaming on youtube, and the website’s algorithm has been recommending videos including the song by the thousands:
“In the end, no one factor made “Over Your Shoulder” a Billboard hit in Japan. Nearly 25 years ago, it was released. More than 15 years ago, it was used on a Japanese reality show about boxing bad boys. Six years ago, Billboard started counting YouTube plays. And just days ago, YouTube apparently began recommending pirated episodes of that reality show to Japanese users, who seemingly binged it in the thousands, playing ‘Over Your Shoulder’ over and over again in the process.”
Read Gizmodo’s full explanation here, it’s actually a pretty interesting combination of strange circumstances. However it happened, way to go Dinosaur Jr.