third world briefcase noun a large portable stereo system associated, stereotypically, with black youth culture US
Be a bum in this part of town, he knew, keep rhythm with your fingers, sport a walkman or a third world briefcase — Thomas Caplan, Parallelogram, p. 121, 1987
— Connie Eble (Editor), UNC-CHCampusSlang, p. 1, Fall 1987