yeodongsaeng Share definition Flag A Korean word, meaning as: little/younger sister, or a friend of yours that is younger than you. Kayden: yeodongsaeng, help me with the dishes, please! little/younger sister of his: Humph. never am I! yeodongsaeng by Blossom like the flowers September 16, 2020 Get the yeodongsaeng mug.