Charli XCX wrote the song during the sessions that produced the tracks for her debut album True Romance
. She penned the tune with Patrick Berger, her collaborator on "I Love It
." It didn't make the final cut and was then offered to Hilary Duff to record.
XCX told MTV UK that Berger has worked with Hilary Duff before, and when the singer's people got in touch with them about her new record, she got very excited. "My number one project as a songwriter is to write for Hilary Duff, so when I heard about this, I was like, 'f---k! Are you serious?! This is my 'in!,'" she recalled. "I'm going to make a Hilary Duff album!' So we sent over 'Boom Clap', but they came back and were like, 'this isn't cool enough for Hilary."
"I was like, crushed," Charli added, sighing. "I thought I was a cool writer, but maybe I'm not. Hilary didn't want my song. What a life-ruiner."
Once Duff declined the offer, XCX decided to use the song as her contribution for The Fault in Our Stars