The flashbang sound effect is based on the idea of a stun grenade blast, a sound style widely used in shooter games, meme edits, and short-form videos. Online, creators use it to simulate a moment of total disorientation: a blinding visual hit followed by ringing ears. Its popularity comes from how quickly it communicates surprise, confusion, or overload in a clip. In meme culture, it often fills the same role as a vine boom sound or MLG air horn, but with a more intense, dazed aftermath.