also: ジェーシー · ジェイシー
noun
female junior high school student
Slang abbreviation from 女子中学生 (joshi chūgakusei). Used in casual, often otaku or net slang contexts.
あのJC、制服がかわいいね。
That female junior high school student has a cute uniform.
JCの間で流行っているらしいよ。
It seems to be popular among female junior high school students.