The song was written by Travis Wood, Steve Moakler, Mark Holman and Emily Reid, and produced by Paul DiGiovanni.

The song was crafted on May 25, 2024, on the final day of a writing retreat in Livingston, Montana hosted by Jordan Davis, who invited songwriters Travis Wood, Mark Holman and Steve Moakler.

Holman developed the song from one of the tracks he created prior to the trip, which was built around some hand claps and a buzzy acoustic guitar.

Wood had already composed a chorus with Los Angeles-based Canadian songwriter Emily Reid; they had briefly delayed their composition of the song after writing the line "I'm here and he's MIA", which they thought had a lot of potential.

Reid's original idea for the title was "He Sure As Hell Ain't", which became the closing line of the chorus that she and Wood had started.

The songwriting team debated using the phrase as the title, but later settled on "I Ain't Sayin'" to avoid usage of the word "hell".