She was saying a word that sounded like luck, lock, and lack, but was not clearly one of them over the others. We'll spell it like "luoack," for sake of argument. She just kept chanting it and giggling, and we couldn't figure it out (pretty sure she was being silly and making up a word, anyway).
So, in an effort to clarify what she was saying, she was asked, "Can you use it in a sentence?"
She thought for half a second and offered up this sentence as a contextual example:
"Yes. I'm talking about the word 'luoack.'"