"Fukkireta" (吹っ切れた) refers to a popular song and video trend within the Hololive community, which is a running gag and a tradition within the community, according to Hololive Fan Wiki. The song "Ochame Kinou" (おちゃめ機能) was created by LamazeP. The video trend involves characters dancing to "Ochame Kinou" while shaking their heads and hips from side to side. The English translation of "Ochame Kinou" is "Mischievous Function".
message to all the people who make these projects: you can remix it if you like and you can use any character but keep the music
