Jisho

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Noun
1. female high school studentSlang, Abbreviation, See also 女子高生, from "joshi kōsei"(女子高生)
Expressions (phrases, clauses, etc.)
2. isn't it obvious?; that's common senseInternet slang, Abbreviation, See also 常考, from "jōshikitekini kangaete"(常識的に考えて)
Other forms
jk 【ジェー・ケー】

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