D12 is the Detroit hip hop group associated with Eminem, and 40 Oz comes from their 2004 album D12 World, built around drinking a forty ounce bottle. Mugen is the long running custom fighting game engine where fans remake characters and stages, which explains this version's game style packaging. Short processed rips like this circulated on soundboards as instant party and fighting references, long after the album track itself. Its appeal now is nostalgia and speed, a recognisable rap title delivered as a sub second game hit.