A childhood belief about swearing

When I was a kid, I didn't know what the word "butt plug" meant. But I knew it was a naughty word, one you weren't supposed to say, so that is what I called my brother when I was angry with him. Father Bob, at the catholic school where I attended, one day gave a lesson in controlling your anger, and asked what names we might call our siblings when we were angry with them. He called on me, first, and I stood up and said loudly, "Butt plug! Douche Bag!" and everyone in the classroom laughed. Except Father Bob! He was so upset, he blustered, was a bright purple, and told me to sit down! I was never called on again! lol