lip-smacking vs yum

lip-smacking

adj

  • Tasty; appetizing. 

noun

  • The act of smacking one's lips 

adv

  • Very. 

yum

adj

  • Delicious. 

intj

  • Indicating delight at the flavor of food. 

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