by and by vs in two shakes of a lamb's tail

by and by

noun

  • Heaven; the hereafter. Usually preceded with "the sweet." 

adv

  • After a short time. 

  • After an indefinite period. 

in two shakes of a lamb's tail

How often have the words by and by and in two shakes of a lamb's tail occurred in a corpus of books? (source: Google Ngram Viewer )