What does "mombly" mean?

From Mason & Dixon, episode 20.

The Boys, up since before Dawn, mombly upon the Floor with Fatigue, lurch over to kiss him good-Night, as if he has never been away

OED.com yields no results.

Google is getting me no where.

The page-by-page annotations have nothing.

Best I can find is from M-W:

dialectal, England : CONFUSE, BEWILDER

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An adjective derived from this verb? Thoughts?

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