arse about vs fanny about

arse about

adj
  • The wrong way round; exactly opposite to that which is desirable; contrary; conceptually inverted; wrong. 

fanny about

verb
  • To waste time or fool around; to engage in activity which produces little or no accomplishment. 

  • To wander about or prowl around. 

How often have the words arse about and fanny about occurred in a corpus of books? (source: Google Ngram Viewer )