プログレッシブ和英中辞典(第4版)の解説
わいわい
〔観客席のざわめきなど〕buzz-buzz（▼擬音語）
外で子供たちがわいわい騒いでいる
Children are 「shouting noisily [making a lot of noise] outside.
何をわいわい言っているんだ
What are you making such a fuss about?
友達とわいわいやるのが好きだ
He likes to 「make merry [have noisy get-togethers] with his friends.
そんなにわいわい言わなくてもいずれやるよ
Don't pester me ― I'll do it 「by and by [one of these days].（▼by and byは「近いうちに」）
その事件は最近週刊誌でわいわい書き立てられている
The affair has been played up in the weeklies recently.／Recently the weeklies have given a lot of space to that affair.