Tasha Catour produced "Snack" and co-wrote it with Palmer, Che Olsen and Alexander Lloyd.

A music video, directed by Rosero McCoy, was released on July 15, 2020, through Palmer's official YouTube account.

Palmer posted a short clip of her in a swimming pool with half of the second verse of "Snack" playing on July 7, three days prior to the song's official release.

[5][11] The song is written in the key of G-flat major and is set in common time with a moderate dance groove with 160 beats per minute (BPM).

[20] Bryant Lydell of The Top Tea wrote that Palmer "offers up catchy lyrics over a refreshing beat".

[21] On July 15, 2020, Palmer posted a preview of the single's music video and announced its release via her Instagram account.

Rosero McCoy directed the single's music video while production was handled by Quenton Burdette and Daniel Button.

[24][25] The video begins with a '90s-inspired retro VHS effect with the title "KEKE" quickly appearing on it and then showing Palmer in a Giuseppe di Morabito-designed double breasted purple blazer dress as the camera begins to close up on her, with the song title "SNACK" appearing soon after.