In our house, my DH referes to my UC as "butt trouble". We have a 3 year old and when my UC flares, she knows it as "Mommy's butt hurts." She also knows that I can't eat certain things, etc during a flare as it makes "Mommy's butt hurt worse."
So last night she wanted pizza and I gave in. She said, "We can order light cheese for you mom." I told her that she could order it when we got there. So we sit down and the waitress comes over and sits in our booth (we know them) and my daughter looks at her and says, "We want to order a pizza with light cheese b/c of my mom's butt."
The waitress looks at me with a "What?" look on her face and I just had to shake my head. But the best part is she said it loud enough for everyone in the restaurant to hear. I was mortified.