Domain Expansion is a high-level technique in Jujutsu Kaisen, the manga by Gege Akutami that became a hit anime series from MAPPA in 2020. By expanding their innate domain, a sorcerer traps an opponent inside a space shaped by their cursed technique, where their attacks are almost guaranteed to hit. Clips of these dramatic activations spread widely through anime edits, reaction videos and short-form platforms, turning the sound into shorthand for an unstoppable power-up. It remains popular because it instantly signals that a fight has reached its most serious stage.