This was a bonus track on the UK, Japanese and collector's edition versions of How to Dismantle an Atomic Bomb.
Bono (from Q Magazine November 2004): "We did this on the very last day in the studio. It was really just for fun, but it came out so well it'll be an extra track on the record in some countries."
This song was reworked from an electronica track called "Xanax and Red Wine" that wasn't quite coming together, but featured the lyric "how to dismantle an atomic bomb." U2 bassist Adam Clayton recalled in the book U2 by U2: "Bono wanted to get that lyric back onto the record and we didn't have much time so the idea came to start from scratch, replay it with a sparse arrangement and adapt melodies and lyrics to fit that new format."
The Naughty by Nature hit "O.P.P." doesn't have any curse words, but many oversensitive radio stations played a "clean" version with the word "kitten" edited out, surely the first time that word was censured.