Deimos is one of the main supporting characters in the Madness Combat series created by Krinkels, usually appearing alongside Hank and Sanford. Madness: Project Nexus is the spin off game from that series where many of his voice lines and grunts were recorded for combat and interaction. Short clips like this yeah yeah were lifted from gameplay and shared on gaming soundboards, where fans use them out of context as reactions. Separated from the shooting, the casual agreement becomes a versatile meme response.