Where does a 3 -year- old learn the word "moron"?

So tonight Jenna brought me a coloring book page with a dragon on it. After talking to me about why it's colored red and pink she said to me, "I think his name is Bob." I don't think she knows anyone by that name so I said something like, "Oh, Really?" She answers with, "No, I think I will call him Moron." Now, moron is not a word I normally use so I am not sure where she got it. It would be nice to be able to blame it on Dustin but I'm pretty sure it wasn't him! I have to say it was super funny to hear her say it so seriously! Man, I have to watch that girl!