Scooby-Doo is the signature dog character from the long-running Hanna-Barbera animated franchise that began with television cartoons in 1969. His voice and laugh became instantly recognizable across generations, which helped the clip spread in meme edits, short videos and reaction posts. Online, creators use the laugh as a shorthand for goofy mischief, nervous humor or a caught-in-the-act vibe. It remains popular because the sound is short, clean and easy to place at the exact moment a visual joke lands.