It's her first "real" word I think, one that isn't yah or nah or mama or dada.
It's tickle.
And she whispers it in a high voice like this, "tickletickletickletickletickle."
Of course Eric would say that it doesn't count because she doesn't say "tickle" without repeating it. Then I joke that he's waiting for the day that she walks in and says, "Tickle, Father."
I think it's amazing and pretty much the cutest thing I've ever heard. What a shock. If I can get it on video I'll post it.