While it's often maintained that the word doozy derives from the "Duesenberg" in the name of the famed Duesenberg Motor Company, this is impossible on chronological grounds. Doozy was first recorded (in the form dozy) in eastern Ohio in 1916, four years before the Duesenberg Motor Company began to manufacture passenger cars; the related adjective doozy, meaning "stylish" or "splendid," is attested considerably earlier, in 1903. So where did doozy come from? Etymologists believe that it's an altered form of the word daisy, which was used especially in the late 1800s as a slang term for someone or something considered the best.