"Daddy," Tralee began. "When you pick your boogers then you can SELL them. That's what sell 'dem (I can only assume that's how she heard it) means."
Needless to say, Jim and I were in stitches while Tralee looked confused and kept asking, "Why are you laughing at me?" I guess we still have some work to do on our vocab lessons or maybe I just need to enunciate better.