adverb
noisily; boisterously; with lively clamor
Sound-symbolic adverb for lively, noisy group activity, often cheerful or energetic rather than merely unpleasant.
子どもたちが教室でわいわい騒いでいる。
The children are making a lively racket in the classroom.
週末は友だちとワイワイ飲んだ。
Over the weekend I had a lively drink with friends.
adverb
going on and on; making a fuss; pestering noisily
Used especially with 言う or 騒ぐ when people complain, object, nag, or make too much fuss about something.
小さなミスでわいわい騒ぐな。
Don't make such a fuss over a small mistake.
周りからわいわい言われて、彼は困っていた。
He was troubled by everyone going on at him.
adverb
crying loudly; wailing; bawling
Used with 泣く and similar verbs for loud, uncontrolled crying; わあわあ is another common sound-symbolic choice for this idea.
迷子になった子がわいわい泣いていた。
The lost child was crying loudly.