The line comes from S.T.A.L.K.E.R. Shadow of Chernobyl, the 2007 first person shooter by GSC Game World set in the Chernobyl Exclusion Zone. Players heard guards and traders repeat the warning as they approached restricted areas, and the flat, irritated delivery made it stick in memory. Clips and remixes spread through gaming forums and YouTube in the following years, turning the phrase into shorthand for telling someone to leave. It remains a staple in gaming soundboards because almost any fan instantly hears the voice.