A week before the release, Zach Bryan posted a snippet of the song on social media and revealed it was written and recorded in Philadelphia.

Bryan then revealed in an Instagram story that he had developed "Blue Jean Baby" into a "half-song" from a demo that he originally teased in September 2023.

[3] The instrumental combines a drum pattern with a guitar riff, as Zach Bryan sings with vigor[4] about his recent romantic entanglements.

[3] The first verse depicts him having a hangover in the morning and flashbacking to his interaction with his lover on the night before, fondly remembering she was wearing a bandana and coveralls and kept a burning cigarette in the pocket of her blue jeans.

[3][4] In the second verse, Bryan describes finding peace and quiet on an evening in a barroom where he could brood over his melancholy, and yearning to see his lover again in the future.