腕白 わんぱく坊主 ぼうずだったら
wampaku bōzudattara

Noun
Da Copula

The "-tara" conditional form ("if/when…") of 腕白坊主

1. If/when (he) was a mischievous/cheeky boy; If (he) were a mischievous/cheeky boy

Tara Conditional