dog's breakfast vs helter-skelter

dog's breakfast

noun
  • An unappealing mixture; a disorderly situation; a mess. 

  • Used other than figuratively or idiomatically: see dog, breakfast. 

helter-skelter

noun
  • Confusion or turmoil. 

  • A helical fairground slide. 

adv
  • In confused, disorderly haste. 

adj
  • Carelessly hurried and confused. 

How often have the words dog's breakfast and helter-skelter occurred in a corpus of books? (source: Google Ngram Viewer )