Question: what does "mushi mushi" mean and in what language? 

Answer: If you mean "Moshi moshi," then it's 'hello' (only on the phone) in Japanese. \n\nBut there's also something - 'mush' which involves getting dogs to pull sledges along in the snow. People shout 'mush mush' at the dogs.\nhttp://education.yahoo.com/reference/dictionary/entry/mush_2;_ylt=AqyhDulR8DNkTDQVuDJJfISsgMMF
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