According to an interview on the Song Exploder
podcast, Grimes' vocals for this song were inspired by comics villain Harley Quinn. "When you're making a record and you're never talking to anybody you just start [thinking], 'Oh, I'm gonna try to write in the voice of…something.' Like with [this song, it has] a Harley Quinn kind of vibe — like just sort of this Joker-y, scary demon chorus," she said
"I hate singing. It's just not something I identify with at all," Grimes added. "I'm pretty much always pretending to be someone else when I'm singing."
Harley Quinn is an adversary of the superhero Batman and commonly appears as the Joker's accomplice and lover.