slip it to vs swap out

slip it to

verb
  • To smuggle (something) to someone; to surreptitiously pass (something) to someone. 

  • To sexually penetrate 

swap out

verb
  • To exchange (something) for (something else). (usually followed by with or for) 

  • To transfer (memory contents) into a swap file. 

  • To exchange (something or someone) for an unused (or less-used) equivalent. 

noun
  • Anything that is swapped out for another; an exchange. 

  • A pre-prepared food item used in place of an unfinished food item in order to cut down the overall preparation time during filming. 

How often have the words slip it to and swap out occurred in a corpus of books? (source: Google Ngram Viewer )