"D12" stands for "Dirty Dozen", as D=Dirty and 12=dozen. It's a rap group consists of Eminem a.k.a Slim Shady/Marshall Mathers, Denaun a.k.a Kon Artis, Big Proof a.k.a. Dirty Harry, Swift a.k.a Swifty McVeigh, Kuniva a.k.a. Rondell Beene, and Bizarre a.k.a. Peter S. Bizarre. "D12" met seven years ago at Detroit's Hip Hop Shop, a local hangout where emcees of all calibers would gather in hopes of droppin' a verse or two during the store's "Saturday open-mic sessions."