I thought, "Wow, that's odd. I've never heard of that before." So I snuggled down onto the livingroom floor next to Holly, gnawing on her bull pizzle, and grabbed my laptop to google it. I found this: Pizzles are almost exclusively used/produced today as chewing treats for dogs. They are a fibrous muscle, and are prepared by cleaning, stretching, twisting and then drying. The word is used today to signify the penis of an animal.
I didn't know what a pizzle was and I certainly had no idea that Holly was eating a dried bull penis every time I gave her one of those treats. Good Lord.
The bonus? William now has a new word for his penis. Terrific.