dickhead vs shitass

dickhead

noun
  • A jerk; a mean or rude person. 

  • A stupid or useless person. 

  • The glans penis. 

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 dickhead and shitass occurred in a corpus of books? (source: Google Ngram Viewer )