have a BM vs wee-wee

have a BM

wee-wee

noun

  • The penis. 

  • Urine. 

  • The vulva or vagina. 

  • An act of urination. 

verb

  • to urinate 

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