curmur vs rip one

curmur

verb
  • To experience indigestion or flatulence; to fart. 

  • To murmur or rumble. 

noun
  • An instance of curmurring. 

rip one

verb
  • To fart. 

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