front bum vs la-la

front bum

noun
  • The vagina or vulva. 

  • A bipartite mass of abdominal fat. 

la-la

noun
  • A woman's genitals, especially the vagina; a sexually permissive woman. 

  • Something unusually good; (occasionally) something unusually bad. 

adj
  • Of indifferent quality; so-so. 

verb
  • To sing or recite the syllable la repeatedly. 

  • To sing (a song) with la replacing the song lyrics. 

How often have the words front bum and la-la occurred in a corpus of books? (source: Google Ngram Viewer )