Wulalawulala comes from Chiikawa, the Japanese manga and anime series by Nagano about tiny cute creatures living surprisingly hard little lives. Usagi, the excitable yellow rabbit, communicates mostly through shouts, laughs and invented noises rather than full sentences, and fans clip those bursts as standalone reactions. Shared as short videos and soundboard clips, this cry became a shorthand for manic happiness and mischief among anime fans. Its appeal is its recognisability: even without context, the voice signals Usagi's reckless, food loving personality instantly.