beer mat vs mud-kicker

beer mat

noun
  • A small square cardboard mat, often with an advertisement for a brewery on it, that is used to rest one's glass on, and to protect the surface of a table or a bar in a pub. 

mud-kicker

noun
  • A workboot designed for outdoor work, especially one that can be worn on muddy ground. 

  • Streetwalker; a prostitute who looks for customers in public places, especially one who works for a pimp. 

  • An unskilled laborer; One who makes his living by outdoor manual labor. 

  • A racehorse. 

How often have the words beer mat and mud-kicker occurred in a corpus of books? (source: Google Ngram Viewer )