腕白 わんぱく小僧 こぞう
wampaku kozō

Noun

1. naughty boy; mischievous boy; little rascal; brat

Yojijukugo
かれはよく近所 きんじょ腕白 わんぱく小僧 こぞうたちをののしったものだ。
karewa yoku kinjono wambakukozōtachio nonoshitta monoda.
He would swear at the naughty boys in the neighborhood.