head over heels vs to the max

head over heels

adv
  • Hopelessly, madly, to distraction, deeply, utterly. 

  • At top speed; frantically. 

  • Tumbling upside down; somersaulting. 

adj
  • Hopelessly smitten, madly in love. 

to the max

prep
  • To the maximum possible degree or extent. 

  • To a great degree or extent; very. 

How often have the words head over heels and to the max occurred in a corpus of books? (source: Google Ngram Viewer )