I'm sure Crab Rave must have been already. It's literally a meme song after all.

 

Otherwise my last entry No Panties fits the bill. That or Elisa Lam for the scary/Hallowe'en type clips.

of my entries apparently Tez Cadey 'Seve' took off on the platform at least enough for someone to do a compilation of TikToks done to the song on YouTube. although the song was a European hit beforehand so that must've helped.

 

that aside it'd probably be TheFatRat 'Monody' to take off, I think, being fairly popular already with 168m YT views. Most of my other entries are a bit too dancey to work as TikTok songs from what I gather of what takes off. Perhaps Flume 'Insane' could work as well being similarly mid-tempo and by a popular artist?