B.M. = Bowel Movement OR = Brian Mulroney

Related:

• IBM: Immense Bowel Movement.
• IBM: Incontinent Bowel Movement.
• IBM: Incredible Bowel Moveme
• IBM: Industry Bowel Moveme
• IBM: International Bowel Moveme
• BMW Bowel Movement Wagon (Bowdlerized term for Shitmobile)
• I B M U B M We all B M For I B M!!!! -- H.A.R.L.I.E.
• Professor: This is gonna be one hell of a bowel movement.
  Afterwards, he'll be lucky if he has any bones left....
• IBM /I-B-M/ Inferior But Marketable; It's Better Manually
  Insidious Black Magic; It's Been Malfunctioning; Incontinent Bowel Moveme...