1. mump - Noun
2. mump - Verb
To move the lips with the mouth closed; to mumble, as in sulkiness.
To talk imperfectly, brokenly, or feebly; to chatter unintelligibly.
To utter imperfectly, brokenly, or feebly.
To work over with the mouth; to mumble; as, to mump food.
Source: Webster's dictionary