Boyoyoyo comes from boyon, a Japanese onomatopoeia for something plump or elastic bouncing and wobbling. Written in katakana as ボヨヨヨ, the repeated yo syllables stretch the effect out, which is why the clip lasts over a second instead of ending as a single boing. Short soundboards and meme edits picked it up as a ready-made label for jiggle physics, bouncing objects and exaggerated anime reactions. It stays popular because viewers recognise the wobble instantly, even without seeing the original scene or knowing Japanese.
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The boyoyoyo sound is a springy Japanese bouncing sound effect used in anime and meme videos for wobbling, jiggling or comically elastic movement.
Boyoyoyo is a drawn-out bouncing noise based on Japanese sound symbolism for something soft and springy wobbling back and forth. The pitch rises and falls in quick repeats, like a jelly, a spring or a round belly jiggling after a poke. It has no words, just a cartoonish boing stretched into several syllables that keeps going longer than expected. That exaggeration is why it lands as comedy rather than realism. Editors use it to make a simple bounce, shake or squash look loose, goofy and impossible to take seriously for a second.