boofheaded vs shit-for-brains

boofheaded

adj

  • stupid; dimwitted. 

  • having an oversized head. 

shit-for-brains

adj

  • Extremely stupid. 

noun

  • An extremely stupid person. 

How often have the words boofheaded and shit-for-brains occurred in a corpus of books? (source: Google Ngram Viewer )