all over the map vs messy

all over the map

prep
  • Widely scattered or distributed; numerous and differing greatly. 

  • In widely scattered directions; in a widely varying manner. 

messy

adj
  • In a disorderly state; chaotic; disorderly. 

  • Prone to causing mess. 

  • Difficult or unpleasant to deal with. 

How often have the words all over the map and messy occurred in a corpus of books? (source: Google Ngram Viewer )