She says "All Done" while simultaneously waving both hands.
We have started baby sign language on several words, and this one has stuck. We use the same hand signals for all done with our dog too, so she sees it a lot (weird, I know).
It is absolutely hilarious when she chooses to use 'all done'. Normally, it is after the first bite of anything she doesn't want to eat. Eggs, all done. Kiwi, all done. Some weird squash/sweet potato mix, all done (I don't blame her on that one).
So much for MaMa, DaDa, or any other of the typical first words....Lacy has spoken....she is All Done.