bummer vs unpleasant experience

bummer

intj
  • Exclamation of annoyance or frustration at a bummer (disappointment). 

noun
  • A disappointment, a pity, a shame. 

  • A lamb (typically the smallest of a multiple birth) which has been abandoned by its mother or orphaned, and as a consequence is raised in part or in whole by humans. 

  • A gay man. 

unpleasant experience

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