Charli told Apple Music she originally planned on calling her fifth studio album Sorry If I Hurt You
. Then one day, while driving her car, the title "Crash" came to her. She called her creative confidant A. G. Cook, who agreed it made sense with the constant car references in her work. Charli also liked the onomatopoeia, how it references "Boom Clap
" and its "punchy, in-your-face" feel.
Having come up with a title, Charli needed a song to go with it, so she and Cook went into the studio and started writing. They knew they needed to come up with something "extremely '80s" to go with the rest of the album's '80s synth-pop sound. "If you could bottle the album into one song, this is it," she said.
Charli inserted some New Jack Swing beats that Cook and the song's co-producer, George Daniel of The 1975, had been sending her, plus a guitar solo, and "these crazy Janet-esque stabs."