talk the hind leg off a donkey vs yackety-yak

talk the hind leg off a donkey

verb

  • To talk a lot. 

yackety-yak

verb

  • To talk pointlessly and uninterruptedly. 

noun

  • prolonged chatter; uninterrupted, idle talk; gossip 

How often have the words talk the hind leg off a donkey and yackety-yak occurred in a corpus of books? (source: Google Ngram Viewer )