Broly is the powerful Saiyan character from the Dragon Ball franchise, and short voice clips of his Japanese delivery are widely reused as reaction sounds online. This yay shout spread in the same way as other brief anime exclamations, because it is easy to recognise, easy to cut, and works even without context. Fans pair it with Goku moments and other Dragon Ball edits, while non fans use it as a generic burst of joy. Its tiny length keeps it popular for fast memes, remixes and soundboard collections.