The line comes from Durarara, the anime about interconnected lives in Ikebukuro, where Shizuo Heiwajima is known as one of the city's strongest and most volatile residents. In episode seven, his frustration boils over into this blunt two-word outburst, a moment that fans lifted because it captures his temper in under two seconds. Since then it has circulated on anime soundboards and in short-form edits, where its brevity makes it easy to reuse whenever a scene needs an instant burst of anger.