FLOSS DANCE

The Floss or Flossing is a dance move in which a person swings their arms, with clenched fists, from the back to the front of their bodies on each side and do these movements repeatedly. Media outlets have commented that the dance is harder to perform than it appears.
The name comes from the moves themselves, which involve "a lot of fast arm and hip swings, as though using a huge, invisible piece of dental floss"
The dance became viral after Russell Horning did it during a Saturday Night Live live performance of Katy Perry's music "Swish Swish", and has since become a trend among children and teens, and has been performed by celebrities in videos.
Flossing is featured in the 2017 video game Fortnite, as a victory animation performed by the characters.