If you talk really, really, really fast and you don't say your words properly -- no one has any idea what you're talking about -- they will not have a conversation with you. So if you speak or talk really, really quickly, or if you mumble -- "Mumble?" "Mumble" means you do not say words clearly. Some people will talk like this. They have their hand -- they put their hand in front of their mouth, and you can't really hear anything that they're saying because