The phrase comes from Kay Jewelers, the American jewelry chain whose long-running advertising slogan plays on the letter K in Kay and the word kiss. The jingle became one of the most recognised retail taglines in the United States through decades of television commercials, especially around holidays and engagement season. Online, the line was shortened and remixed as a standalone sound, with users leaning into the pun and the overly earnest delivery. It survives as a quick romantic shorthand that everyone understands, even without the original commercial around it.