The variety of the – generally poor – people living in the part of the old town called Matte, known as Mattenenglisch (Matte-English), even though it has little relation with English, but has a number of loans from Jenisch, Rotwelsch and Yiddish.
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A lot of the vocabulary known as typical to Bernese German comes from the Mattenenglisch, e.g. Gieu 'boy', Modi 'girl'.
In addition to it, there was also a special kind of Pig Latin which is the proper Mattenenglisch according to some people.