euphoric vs happy as a pig in shit

euphoric

adj
  • Feeling great well-being or elation or intense happiness; characterized by euphoria 

  • Productive of euphoria, causing great joy 

noun
  • A drug that causes euphoria; a euphoriant. 

happy as a pig in shit

adj
  • Extremely happy; obviously satisfied and carefree. 

How often have the words euphoric and happy as a pig in shit occurred in a corpus of books? (source: Google Ngram Viewer )