Fluent, Paper Thin, Leafing Through A Book
adverb, noun, な adjective, の adjective, オノマトペ
Parrot, parrot (ペラペラ), your speaking is so fluent! ペラペラ is an オノマトペ that describes someone speaking a language fluently, or simply being a real chatterbox. Related to this, ペラペラ also means leafing through a book. And in an extension of that meaning, it can describe something paper thin or flimsy, like a piece of paper from that book you're leafing through.
どうやって日本語ペラペラになったの？
How did you become fluent in Japanese?
あー、はやく英語がペラペラ話せるようになりたい。
Ah, I want to be able to speak English fluently soon.
ねえ、さっきから、ペラペラペラペラうるさいよ！ここ、図書館だよ？
Hey, you've been blabbing on and on! We're in the library, remember?