shit ass vs shitass

shit ass

noun
  • A jerk; an inappropriately or objectionably mean, inconsiderate, contemptible, obnoxious, intrusive, or rude person. 

shitass

noun
  • A jerk; an inappropriately or objectionably mean, inconsiderate, contemptible, obnoxious, intrusive,stupid or rude person. 

  • a term of address 

How often have the words shit ass and shitass occurred in a corpus of books? (source: Google Ngram Viewer )