boink vs trephine

boink

verb
  • To have sexual intercourse (with); to bonk. 

  • To hit or strike. 

noun
  • A real-world social gathering of computer users. 

  • Sexual intercourse. 

  • A sound of something hitting or bouncing off a surface, similar to plunk, but with more connotations of bounciness. 

trephine

verb
  • To perforate with a trephine. 

  • To use a trephine during surgery. 

noun
  • A surgical instrument with a cylindrical blade used to remove a circular section of tissue, f.e. bone or cornea; a trepan. 

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