pecha-kucha
The sound of people chatting away endlessly about trivial things. Often implies the conversation is noisy and somewhat annoying.
💡Friends gossiping at a cafe — 'They were talking pecha-kucha for hours!'
授業中にぺちゃくちゃしゃべらないで。
Don't chatter pecha-kucha during class.
The girls were ___ about the latest gossip all lunch break.
女の子たちは昼休みずっと噂話を○○しゃべっていた。