Boyon is the Japanese onomatopoeia for a springy, bouncing movement, the kind of word used in manga and anime to suggest something soft wobbling or springing back. Online, short clips labelled boyon have become a shorthand for that same cartoon bounce, shared in meme edits and short-form videos where a single springy noise does the comedic work. Because it is instantly recognisable without any dialogue, it travels easily across languages and formats, and creators keep returning to it for quick, visual jokes about jiggle, bounce and elasticity.