This is a question that Zee has been asking everyone lately.
She asked my mom yesterday. Grandma told her "no" and them asked Zee if she had peanuts. Zee responded that she doesn't have peanuts, she's not a bubby (this is what she calls her brother).
You may have figured it out by now that she is referring to the boy parts. Isn't it funny what names kids come up with for things????