"Pump" by Valentino Khan.
The song's electric feel is very rhythmic and gets really, really magical later on, which is the main reason it's called the magical crotch twerking dance.
Background of the songwriting
Katy Perry has explained that 'Swish Swish' is a song written to encourage people who have been bullied. On The Late Late Show with James Corden, Katy Perry admitted that the song was written for Taylor Swift. The two started to be at odds at the time from their original relationship as close friends over their dance partners (see Taylor Swift and Katy Perry feud).
But Katy Perry personally believes that Taylor Swift started this thing in the first place, she had made a pass at Taylor Swift but Taylor Swift didn't appreciate it and even wrote a song called "Bad Blood" to fight back so Katy Perry decided to let Taylor Swift handle it on her own and wrote a song called "Swish Swish" to fight back. And Nicki Minaj's lyrics were a comeback to Remy Ma.