Smarty Pants

The other day I was working on part of a history project for the kids.

Aren't you intrigued?

While I was talking to David about a problem I was having with it, I mentioned to him that I learned a new word.  Then, like normal, I forgot the word but was able to define it for him.  But before I could finish he said, oh internecine you mean.  Yeah that's the one smarty Latin pants.