gan-gan
Forceful, metallic banging — hammering nails, a splitting headache, or blasting loud music. Implies strong intensity.
💡Construction noise next door — 'They were hammering gan-gan since early morning.'
朝からがんがん工事の音がする。
The construction noise has been going gan-gan since morning.
My head was pounding ___ after staying up all night.
徹夜のせいで頭が○○する。