Jisho

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あお ケツが青い
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Expressions (phrases, clauses, etc.), I-adjective (keiyoushi)
1. wet behind the ears; inexperienced; immature​Idiomatic expression, from the bluish tinge of children's buttocks
Other forms
尻が青い 【けつがあおい】、尻が青い 【しりがあおい】

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