It was written by the artists, Savan Kotecha, Ant Clemons, and producers Frank Dukes & Louis Bell.

In December 2019, Twitter users pointed out similarities between "My Oh My" and the 1992 song "Llaman a la puerta" by the Peruvian reggae band Tierra Sur.

[11] According to reporter Eilish O'Sullivan from The Daily Dot, "the songs' call and responses are what make them sound especially similar".

[12] Pochi Marambio, Tierra Sur's bandleader and composer of "Llaman a la puerta," announced on social media that he had hired a legal entity to contact Cabello or her representatives to reach an amicable settlement.

[14] "My Oh My" peaked at number six in Ireland, and charted in the top 20 in various other countries including Australia, Belgium, Finland, Greece, the Netherlands, New Zealand, and Singapore.

She then goes to a bar and meets an up-and-coming movie director, portrayed by DaBaby, who then hires her to play the role she always wanted.

Throughout the video, Cabello utilizes katana in a Kill Bill inspired film titled 'La Bonita Blade',[17] and performs a Grease-style dance, alongside the use of subtitles.

It featured Cabello and the dancers calling each other through FaceTime before performing the song's dance choreography in each of their homes and parks.