come off vs get one's rocks off

come off

verb
  • To appear; to seem; to project a certain quality. 

  • To occur; to take place. 

  • To have some success; to succeed. 

  • To become detached. 

  • To escape or get off (lightly, etc.); to come out of a situation without significant harm. 

get one's rocks off

verb
  • To derive enjoyment from something. 

How often have the words come off and get one's rocks off occurred in a corpus of books? (source: Google Ngram Viewer )