Rap collective SOB X RBE formed in Vallejo, California in early 2016, founded by young rappers Yhung T.O, DaBoii, Slimmy B, and Lul G. The group's moniker stands for "Strictly Only Brothers, Real Boi Entertainment." While still in their early teen years, Yhung T.O and DaBoii worked on music with whatever rudimentary technology they had access to, often recording lo-fi songs on their phones. The group took shape when Yhung T.O and DaBoii teamed up with neighborhood friends Slimmy B and Lul G