Hello, let me answer this question for you. Usually dk uniforms are for male high school students. Romaji Stan Kukusai, go dk. Dk uniforms usually include sweaters, shirts, ties, lapels, western-style uniforms and other clothing types. So when girls say dk boys, they mean boys who wear dk uniforms every day. At the same time, such boys are usually liked by girls. In addition, corresponding to DK is JK, which is the abbreviation of "じょしここぅせぃ" (female college student) romaji“jyoshi koukousei "(taking" j "and" j "). I hope I can help you. You can talk to me privately if you have any questions.