mùdùnmúdùn noun /mũ̀.dũ̀.mṹ.dũ̀/
Definitions
  1. any soft internal organ or body part; bone marrow, marrow
  2. any soft internal organ or body part; brain
Etymology
Compare with Ifè mɔ̀nɔ̀mɔ́nɔ̀, ultimately of ideophonic or onomatopoeic origin.
Source: Wiktionary, where this word is spelled “mudunmudun”. Reference: en-mudunmudun-yo-noun-Sw38Vy2I