For something (actor + CVCV- + -um- & patient) to become soft and often spongy, as of a boil when filled with pus; a banana when overripe.
CVCV- + -um-: yumumoyūmoh
munyumoyūmoh.
sup. ma'adyumoyūmoh.
Soft, as described above.
Nanonan han poghan Kumul'ug ti munyumoyūmoh.
The boil of Kumul'ug is pussy because it is soft.