I'm having difficulty uploading pictures today so this will just be a little story.
If The Wog wants more of something during a meal or snacktime, she will usually say and sign "more." She had an early breakfast with her father over the weekend while I slept in; later that day, he informed me that he was almost sure the Wog requested "seconds." Sure enough, the next day after she polished off some blueberries after lunch, I heard it for myself: "Seconds! Seconds! Seconds!"
The Wog pretty much exclusively eats her meals with me and her father and "seconds" is not a term we use. We're stumped trying to figure out where she picked it up, but it sure is cute.