Eh Boss comes from the Filthy Frank universe created by George Miller, better known as Joji, whose YouTube series became a major influence on absurdist internet comedy in the 2010s. The short greeting was clipped from that chaotic style of sketch and spread on its own through reposts, edits, and soundboards. Separated from its original scene, it became a reusable shorthand for addressing anyone in charge. Its popularity has lasted because the line is instantly recognisable, easy to quote, and vague enough to fit almost any workplace or gaming situation.