Nyeh heh heh is the signature laugh of Papyrus, the enthusiastic skeleton from Toby Fox's Undertale, released in 2015. Papyrus uses the laugh when he is trying to sound like a fearsome villain, even though he is warm, earnest and famously bad at being scary, which is why fans adopted it as a joke. Clips of the laugh spread through Undertale playthroughs, animations and short-form edits, where it became shorthand for misplaced confidence. It remains popular because it is instantly recognisable, easy to place over a reveal, and funny without needing any context from the game.
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The goofy nyeh heh heh laugh from Undertale character Papyrus, a short smug chuckle creators use for silly villain reveals and meme edits online.
This is a short, cartoonish laugh delivered in a high, confident voice, with the syllables stretched into a mocking nyeh heh heh rhythm. It starts with a nasal, teasing snort, then bounces through three quick chuckles that sound more playful than threatening, like a self-satisfied villain who thinks his plan is brilliant. Because it is only a couple of seconds long, it lands as a punchline rather than a full laugh, instantly making a moment feel smug, goofy and a little dramatic. It works best when a character has just been outsmarted, revealed a ridiculous scheme, or is pretending to be far more menacing than they really are.