noun
chatterbox; talkative girl; precocious girl
Colloquial and somewhat old-fashioned term for a girl who talks a lot or acts more grown-up than her age. Often used affectionately or teasingly.
うちの娘は本当におちゃっぴいで、いつも喋ってばかりいる。
My daughter is a real chatterbox; she's always talking.
あの子はおちゃっぴいだけど、憎めないね。
That girl is a precocious little thing, but you can't help liking her.