Soiya is a traditional Japanese kakegoe, one of the rhythmic shouts used at matsuri festivals to coordinate people carrying a mikoshi shrine and to keep a crowd moving in time. The call is meant to be answered and repeated, which is why a single shout feels like part of a larger celebration. Online, the clipped version spread through soundboards, anime edits and short videos, where creators borrow that festival timing and energy for lifts, charges, dances and sudden comedic efforts without needing the full chant.