peabrain vs short bus

peabrain

adj
  • stupid, clumsy, idiot 

noun
  • a stupid or clumsy person; a cretin. 

  • the brain of such a person. 

short bus

adj
  • Stupid; dumb; slow. 

noun
  • A shorter school bus, typically equipped with a wheelchair lift, used for transporting children who are physically disabled or who are being educated in special programs, often for learning disabilities. 

How often have the words peabrain and short bus occurred in a corpus of books? (source: Google Ngram Viewer )