"Uh-Oh"

Garth would argue that Derek's first word was Dada. Okay, it's probably true, but totally unfair! Why won't they say Mama first? I think the first word that he says, and understands what he is saying is "uh-oh." He has been saying it a lot the past few days. The other day at the store, he would say "uh-oh" then throw his toy on the floor. The older kids thought he was hilarious so Derek did it over and over.