muggins vs sitting target

muggins

noun
  • A fool or idiot (especially as an ironic way of referring to oneself). 

  • The act of stealing another player's points because they either mispegged or counted up incorrectly. 

  • A game of dominoes in which the object is to make the sum of the two ends of the line some multiple of five. 

  • A card game based on building in suits or matching exposed cards, the object being to get rid of one's cards. 

sitting target

How often have the words muggins and sitting target occurred in a corpus of books? (source: Google Ngram Viewer )