oncer vs smackeroo

oncer

noun
  • A one-pound note. 

  • A person with whom one shares a single sexual encounter, a one-night stand. 

  • A person who does something once. 

  • A single sexual encounter between two individuals, a one-night stand. 

smackeroo

noun
  • Synonym of dollar. 

  • Synonym of kiss. 

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