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.