also: おかあさんこ
noun
mother's boy; mother's girl; mama's child
Refers to a child (of any gender) who is very attached to their mother. Often used affectionately or teasingly.
うちの息子はお母さんっ子で、いつも私の後をついてくる。
My son is a mama's boy and always follows me around.
彼女は小さい頃、お母さんっ子だったらしい。
Apparently she was a mama's girl when she was little.
Refers to a child attached to their father, the paternal counterpart of お母さんっ子.
Compound of お母さん (mother) + っ子 (child), with the geminate っ adding an affectionate or diminutive nuance.