evacuate one's bowels vs wee-wee

evacuate one's bowels

wee-wee

noun

  • The penis. 

  • Urine. 

  • The vulva or vagina. 

  • An act of urination. 

verb

  • to urinate 

How often have the words evacuate one's bowels and wee-wee occurred in a corpus of books? (source: Google Ngram Viewer )