I was raised to use polite words for things. Not "pregnant", but "expecting". Not "breastfeeding", but "nursing". You get the idea.
With my kids, I have just always used the word "bum" to describe the area covered by underwear. That goes for the whole area. Then if a child tells me that their bum hurts, which every kids does, I narrow down the problem by asking a follow-up question, "Front or back?"
This seemed specific enough for the problem at hand, until my son realized that he had front, back and a "hose". Which required different attention and altogether different alarm. And, no, that is not the new Anatomy term.
Tonight I get this: "Mom I think there's something wrong with my "Pee Emitter"."
I laughed so hard that my pee emitter malfunctioned.