What is the meaning of -ba?

Kinship suffix. It is usually found attached to unknown stems.

forms feminine nouns usually denoting an action, process or its result

romanization of -𐌱𐌰

into

eye dialect spelling of -ban

Rōmaji transcription of ば

forms feminine nouns meaning the action of a verb

Suffix appended to words to create a feminine noun, usually denoting an action.

Source: wiktionary.org