buu-buu
Voicing displeasure with whiny, grumbly complaints. Like a child who doesn't want to do their homework — full of protest sounds.
💡Being told to clean their room — 'She was buu-buu about having to do chores.'
宿題をやれと言われてぶうぶう文句を言っている。
She's complaining buu-buu about being told to do homework.
The kids were ___ about the early bedtime.
早く寝なさいと言われて子どもたちが○○文句を言った。