lip-smacking vs only too

lip-smacking

adv
  • Very. 

noun
  • The act of smacking one's lips 

adj
  • Tasty; appetizing. 

only too

adv
  • very, all too. 

  • to a high degree; very well or very much 

How often have the words lip-smacking and only too occurred in a corpus of books? (source: Google Ngram Viewer )