"ABCDEFU" (also known by its radio-edited title "ABC (Nicer)"; stylized in all lowercase) is the major-label debut single by American singer Gayle,[3][4] released on August 13, 2021, through Atlantic and Arthouse Records.

Nancy Berman, a marketing manager at Atlantic Records, commented, asking for a song that incorporates the alphabet.

[11] In an interview with Tongue Tied Mag, Gayle explained the inspiration behind the song: "After the breakup, I was trying really, really hard to be a nice person.

"[12] On March 31, 2021, Gayle stated on Instagram that she had dislocated her middle finger, and the X-ray scan from the hospital was used for the single's cover art.

[18] The song's title and lyrical content are a play on words incorporating the first six letters of the alphabet with the addition of the twenty-first, to form an initialism for the profane phrase "Fuck yoU".

[19] April Bredael of Tongue Tied Magazine thought the song "adds to a growing list of accomplishments" of the singer with tracks that are "authentic, honest, and unapologetic".