What The Heck Was This Teacher Thinking?

So my friend and I were having a very awkward (yet somehow insanely hilarious) conversation involving kidney stones, toe nails, and your oris. She was was laughing when she was trying to tell me something about ori (what's the plural form anyways?) and busted out and said it really loud during homeroom. The teacher was all like, "What did you just say?" and this other kid shouts, "!!!!" And the teacher is just like, "Oh! Okay!" I mean, he should be shocked more so than easy going when 13 year olds start talking about s, right? I just want to know why the heck he found that appropriate for us to be talking about. XD