From Longman Dictionary of Contemporary Englishnineteen to the dozennineteen to the dozenFAST/QUICKif you talk nineteen to the dozen, you talk very quickly and without stopping → nineteen
Examples from the Corpus
nineteen to the dozen• Everybody except Jurnet clapped, still talking nineteen to the dozen.• Theories must be abounding nineteen to the dozen.• They often went on excursions, always talking away nineteen to the dozen. 