The origin of that stupid laugh is unclear, as the clip circulated online in a sped-up version before being slowed down to the pitch heard here. That slowed version helped it stand out from cleaner cartoon giggles, giving it a drawn-out, goofy character that editors could reuse instantly. It spread as a general meme laugh rather than a quote tied to a known character, popping up in compilations, gaming edits and reaction videos where a dumb moment needed an obvious, slightly insulting laugh track to finish the joke.
About this sound
That stupid laugh is a goofy, sped-up giggle slowed down to its original pitch, used as a meme sound effect for dumb jokes and silly fails online.
That stupid laugh is a high, goofy giggle that sounds deliberately dumb, with a loose ahh quality that makes it feel more mocking than joyful. The pitch wobbles and the timing is slightly too long, so it lands like someone laughing at the worst possible joke. It does not feel warm or friendly, which is exactly why editors use it as a punchline. The sound turns a small mistake into a full roast, signalling to viewers that whatever just happened was not clever, cool, or worth taking seriously at all.