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From The Collaborative International Dictionary of English v.0.48:
Mumm \Mumm\, v. i. [imp. & p. p. Mummed; p. pr. & vb. n. Mumming.] [D. mimmen to mask, mom a mask; akin to G. mumme disguise; prob. of imitative origin, and akin to E. mum, mumble, in allusion to the indistinctness of speech occasioned by talking from behind a mask. Cf. Mumble, Mummery.] To sport or make diversion in a mask or disguise; to mask. [1913 Webster] With mumming and with masking all around. --Spenser. [1913 Webster]