I'm the guilty one on that front! Zelda most often gets called "You Butt." It's all out of loooove, though!

For example, when I had the bathroom all set up for Mowgli before I caught him....

Zelda went strolling into the bathroom and started pawing at the little litterbox that I had ready. I wasn't in a position to stop her at the time, so I'm just going, "No! No no no! Not yours!" The next thing I know she's squatting and taking care of business. When she was done, all I could say with the deepest of affection and love was, "You butt."