Xd and lol come from early internet chat slang, where xd imitated a squinting laughing face and lol meant laughing out loud. Combined as xd lol, the phrase became shorthand for finding something extremely funny online. As a soundboard clip, it circulates without a credited source work or creator, shared instead as a generic funny reaction for memes, gaming videos and group chats. Its appeal is instant recognition: even without context, listeners understand it signals exaggerated amusement, which is why creators keep reusing it for fails, pranks and silly edits.