Many parents have "cutesy" names they use (primarily with their kids) for going to the bathroom. Aside from the usual #1 and #2, my family frequently used the term "otherkind" (one word) for a #2 event. As a very young child, I thought everyone used this expression. Then one day, we had company, and they brought their seven year old daughter with them. When the girl exited the bathroom, her mother inquired, "Big or Little, Jane?" I was gobsmacked! Since then, I've taken an informal accounting of the various (often humorous) words that families use to describe this less than attractive activity in which we all indulge. What words did your family use???
Heh. Given that my mom explained sex and reproduction using Grey's Anatomy (before I was in school), her use of "BM" (Bowel Movement) makes sense. Never found out where her family got the term "Make a Lake" from. My dad's was "take a leak" - which I've heard from other people.
When I was little, my mom taught us to say "potty" or "BM" if there was a reason for her to know which one. Other kids in school would say #1 and #2.
With my kids, I think I used "potty" and "poop" and now my daughter has my grandkids say "pee" and "poop" and it's hilarious to be eating dinner, while my 4 year old grandson is announcing loudly from the bathroom, "I'm pooping!"
Kind of related, I remember laughing hilariously when my 5 year old son was a kindergartner and was learning geography at school. He called me into the bathroom excitedly, saying "I just made Madagascar!" Puzzled, I looked in the toilet bowl, and sure enough there was the shape of Madagascar made with the bubbles in his pee.