Again , though , I 'm lazy and only mumble a few words in disagreement .
Now there are a variety of chat clients available , including ventrilo , teamspeak , and mumble .
Going back to language , think about what you make sense of when people speak : they mumble , break all the rules of grammar , slur words and so on .
In july he takes a dip in an arctic swimming hole . In october he studies animal hibernation . In march he goes on a survival course and learns about the " umbles " : as hypothermia sets in you mumble , fumble , grumble , stumble , then finally tumble .