JK ジェー・ケー Also written jk Meanings Noun female high school student (from "joshi kōsei"(女子高生)) See also: 女子高生 (じょしこうせい). Expression isn't it obvious?; that's common sense (from "jōshikitekini kangaete"(常識的に考えて)) See also: 常考 (じょうこう). Word lists Slang Jinuma: Japanese Dictionary · Word lists