This is the 346th most frequent Hindi word.
चटर
The Hindi word "चटर" refers to someone who is talkative or chatty.
Here, 'चटर' is part of the phrase 'चटर-पटर', referring to quick or continuous chatter, emphasizing the way someone speaks.
वह चटर-पटर बातें करता है।
He speaks very rapidly.
In this context, 'चटर' again in 'चटर-पटर' describes the rapid activity, this time of tapping.
बच्चों ने चटर-पटर खिड़की पर हाथ मारा।
The children rapidly tapped their hands on the window.
Here, 'चटर' describes the texture or sound of crisp pages when handled.