botty vs rear end

botty

noun

  • bottom 

  • A term of address for a bot (automated software process). 

adj

  • Resembling a bot (automated software process); botlike. 

rear end

noun

  • The buttocks. 

  • The back or hindmost part of anything, such as a car. 

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