head case vs wackadoodle

head case

noun

  • Used other than figuratively or idiomatically: see head, case. 

wackadoodle

noun

  • A crazy, irrational, or eccentric person. 

adj

  • Crazy, irrational, or eccentric. 

How often have the words head case and wackadoodle occurred in a corpus of books? (source: Google Ngram Viewer )