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From The Collaborative International Dictionary of English v.0.48:
Mump \Mump\, v. t. [imp. & p. p. Mumped; p. pr. & vb. n. Mumping.] 1. To utter imperfectly, brokenly, or feebly. [1913 Webster] Old men who mump their passion. --Goldsmith. [1913 Webster] 2. To work over with the mouth; to mumble; as, to mump food. [1913 Webster] 3. To deprive of (something) by cheating; to impose upon. [1913 Webster]