Hot answers tagged regional
As @sollniss already mentioned, this is just a regional pronunciation of the word written literally. The tone of the text is rather informal and the author probably didn't worry too much about using standard spelling (you can tell just by looking at nem instead of einem). However, this is not exclusive of Berlinerisch. This map shows other regions that ...
Meinet is the berlinerisch version of meines.
The only widely accepted spelling is "meines Wissens" It is as early as the 16th Century when the term "meines Wissens" was used in written German documents. The earliest Google reference dates back to 1539: Another spelling was never used, at least not within the limits we can search by Google (search hits for "meinet wissens" were exclusively from ...
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