to talk about somebody/something in a confused way, especially for a long time
پرتوپلاتگفتن, حرفنامفهومزدن, پرچانگی کردن, بیهوده گفتن, هذیان گفتن, سخن پراکنده گفتن
He had lost track of what he was saying and began to ramble.
What is she rambling on about now?