From Wiktionary, the free dictionary
Affixed moh, mwah + a-. Doublet of amoh (“full of holes, worn out”).
amwah
- open, raw, gaping
- "amwah" in P.J. Zoetmulder with the collaboration of S.O. Robson, Old Javanese-English Dictionary. 's-Gravenhage: M. Nijhoff, 1982.