cack vs frag

cack

verb
  • To kill. 

  • To squawk. 

  • To laugh. 

  • To incorrectly play a note by hitting a partial other than the one intended. 

  • To defecate. 

  • To defecate (on); to shit. 

noun
  • A discordant note. 

  • A squawk. 

  • Excrement. 

  • Rubbish. 

  • An act of defecation. 

  • Penis. 

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. 

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