The sound comes from fan culture around Jujutsu Kaisen, the manga and anime series featuring Ryomen Sukuna as a powerful cursed spirit and main antagonist. Online, fans adopted the slang term pookie, an affectionate nickname for someone adored, and applied it ironically to Sukuna despite his cruelty. Short clips using the phrase spread through TikTok edits, anime soundboards and chat replies, where the contrast became the joke. It remains popular because it captures a specific fandom habit of softening intimidating characters into cute favorites.