self-deletion vs swamp water

self-deletion

noun
  • An act of suicide; an act of taking one's own life. 

  • The act of self-deleting. 

swamp water

noun
  • Synonym of suicide (“beverage combining all available flavors at a soda fountain”) 

  • Used other than figuratively or idiomatically: see swamp, water. 

How often have the words self-deletion and swamp water occurred in a corpus of books? (source: Google Ngram Viewer )