This question is out of scope but it arose while tagging a TEI document and since the list has many philologists/linguists somebody may have an answer. Is there an etymological connection between English ‘quoth’ and German ‘Quatsch’? Or is that a form of “Etymogelei”? The DWDS website says that the word goes back at least to the 16th century but suspects an onomatopoetic origin (like ‘klatschen’ or ‘patschen’). On the other hand, language is always a primary component of ‘quatschen’.
From the OED you learn that Old English coeða has an Old High German equivalent ‘quedan’.
Plausible or ‘alles Quatsch’