1.To move the lips with the mouth closed; to mumble, as in sulkiness. "He mumps, and lovers, and hangs the lip."
2.To talk imperfectly, brokenly, or feebly; to chatter unintelligibly.
3.To cheat; to deceive; to play the beggar. "And then when mumping with a sore leg,... canting and whining."
4.To be sullen or sulky. (Prov. Eng.)