brown eye vs windpipe

brown eye

noun

  • the anus 

  • an eye of which the iris is brown 

windpipe

noun

  • The anus. 

  • A section of road or bridleway which has a reputation for having strong crosswinds or localized wind swirls. 

  • Any duct for air or other gas. 

  • The trachea. 

How often have the words brown eye and windpipe occurred in a corpus of books? (source: Google Ngram Viewer )