Xoxo has long been used in letters and messages as shorthand for hugs and kisses, with the x standing for a kiss and the o for a hug. Online, that simple sign off became a reusable audio joke for creators who needed a fast way to signal affection without explaining it. The clip spread through soundboards and short form edits where brief reaction sounds travel easily, and it remains popular because the meaning is instantly clear across romantic, friendly, and sarcastic contexts, even without any dialogue before or after it.