adverb
with a bang bang; repeated loud noise
Mimetic adverb for repeated loud, sharp sounds like hammering, gunfire, or explosions.
隣の家で誰かがバンバン壁を叩いている。
Someone next door is banging on the wall repeatedly.
adverb
at a mad pace; vigorously; like crazy
Describes doing something energetically, rapidly, or without restraint. Often used with verbs like 食べる, 飲む, 進む, 使う.
彼はバンバンお金を使う。
He spends money like crazy.
仕事がバンバン進んで気持ちいい。
Work is progressing at a mad pace and it feels great.