grypsera

As a noun dialect

is (linguistics) a variety of a language (specifically, often a spoken variety) that is characteristic of a particular area, community or group, often with relatively minor differences in vocabulary, style, spelling and pronunciation.

As a proper noun grypsera is

a non-standard dialect of polish with elements of other languages, used traditionally by recidivist prison inmates, that evolved in the nineteenth century in the areas of the russian partition.