have a BM vs wee

have a BM

wee

adj
  • Small, little. 

  • You looked a little cold, so I lit a wee fire. 

noun
  • A short time or short distance. 

  • Urine. 

  • An act of urination. 

verb
  • To urinate. 

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