Official Site: http://www.d12online.com/ | @thereald12 | www.facebook.com/107591109312287
D12 means 'The Dirty Dozen' and they're from Detroit, Michigan.
They formed in '96 and are associated w/Eminem and the late Proof.
There are currently four members: Eminem, Kuniva, Swifty McVay, and Fuzz Scoota