Mattenenglisch

Mattenenglisch, in Bernese German Dialect Mattenänglisch, is a name for the varieties traditionally spoken in the "Matte", the old working class neighbourhood of the Swiss City of Bern. It is used in two different senses: Either for the traditional sociolect of that neighbourhood or for a special kind of Pig Latin that was used there. In the second half of the 20th century, both have fallen out of use because after the traditional social stratification has been completely changed, the "Matte" is no longer a working-class neighbourhood. However, there are voluntary associations that cultivate Mattenenglisch.
Mattenenglisch sociolect.
The Mattenenglisch sociolect was the working class variety of the Bernese German dialect. It had a characteristic vocabulary that was partly influenced by varieties such as Rotwelsch, Jenisch or Yiddish, because people wanted to communicate in a way the police would not understand. While most Mattenenglisch words have fallen out of use, some have spread into common Bernese German usage, thus becoming shibboleths of Bernese German, for instance the words "jiu" 'yes', "Modi" 'girl' or "Gieu" 'boy'.
Mattenenglisch Pig Latin.
Until the mid 20th century, a special variety of Pig Latin was used by the kids in the "Matte" neighbourhood. Unlike in other varieties of Pig Latin, the first vowel of the word is completely substituted.
The rules are as follows: