One of the mysteries of the English language finally explained.
And so on and so forth; = "et cetera".
Late 19th century. From French et patati et patata, alteration of patati, patata, itself a variant of † patatin, patatac, a reduplicative formation imitative of a repeated chattering sound, with insertion of et ‘and’ before each imitative element.
et patati et patata/eɪ ˌpatətiː ˌeɪ patəˈtɑː/
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