like an overgrown child/schoolboy/schoolgirl etc
looking or behaving like a child, although you are an adult
chatter or chatter away or chatter on to talk continuously in a fast informal way, usually about unimportant subjects
Stop chattering and open your books.
She chattered on for twenty minutes while I got ready.
chatter about: What have you two been chattering away about all morning?
با این اوصاف جمله شما رو میشه به شکل زیر ترجمه کرد:
"شبیه یه دخترمدرسه ای داشت وراجی میکرد/زر میزد"