gotsutto
The dull, heavy sound of banging hard into something solid once — a head hitting a pillar or a shelf corner.
💡Bumping your head — 'I hit the door frame gotsutto and saw stars.'
柱に頭をごつっとぶつけた。
I banged my head gotsutto against the pillar.
I ___ banged my head on the shelf corner.
棚の角に頭を○○とぶつけた。