1 The state of a program, computer, or networked system when it produces totally inappropriate responses to the data it is given. For example, a browser is in mumble mode if instead of displaying normal Web pages it displays flashing blank colours.
2 Sometimes used to describe users who are incapable of communicating: for example, ‘I could not understand any of John's postings to the newsgroup. He always seems to be in mumble mode.’
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