frag vs send to the glue factory

frag

verb
  • To kill. 

  • To hit with the explosion of a fragmentation grenade. 

  • To deliberately kill (one's superior officer) with a fragmentation grenade. 

  • I fragged him but he fell off the ledge afterwards. 

noun
  • A successful kill in a deathmatch game. 

  • A fragmentation grenade. 

send to the glue factory

verb
  • To kill, usually a horse. 

  • To retire or remove from prominence, usually due to obsolescence, old age or injury. 

How often have the words frag and send to the glue factory occurred in a corpus of books? (source: Google Ngram Viewer )