ごっつんこ

adverb, noun or participle which takes 'suru'

bumping into each other; colliding gently

Onomatopoeic or mimetic word describing a light collision or bump, often used in children's language or playful contexts. Can be used adverbially or with する.

• 子こ供どもたちが廊ろう下かでごっつんこした。

  The children bumped into each other in the hallway.

• おでことおでこが