been wondering this all day where the did German word kauderwelsch come from?

The word "Kauderwelsch" is thought to have originated in the 16th century as a mocking term used by German speakers to refer to the languages spoken by foreign merchants and travelers. It is believed to be derived from the words "kaudern," which means "to gabble," and "welsch," which refers to the Romance languages spoken in Italy and France. Over time, the word Kauderwelsch came to be used more generally to refer to any language that is unintelligible or difficult to understand.