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.
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.
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.
Until the mid 20th century, a special variety of Pig Latin was used by the kids in the Matte neighbourhood.