Timothy Blair (January 3, 1967 – February 14, 2013), better known by his stage name Tim Dog was an American rapper from the Bronx, New York, who rose to prominence during the early 1990s with his debut LP Penicillin on Wax and the celebrated diss track "Fuck Compton." Tim had already appeared on songs with the Ultramagnetic MCs and went on to form a duo, Ultra with member Kool Keith.