Conversations with an almost-8-year-old

Backstory - K was in Little Miss's class in kindergarten and is in her second grade class as well. They were going to get married in kindergarten if she didn't marry this other boy. 

Little Miss: You know, K, right? Me: Aren't you going to marry him? Little Miss: Ugh, no. Hashtag fail. 

 Seriously. The girl just said "hashtag". Where does she come up with this stuff? I don't even know if she knows what it means, but she's always been good at figuring out correct context even if she didn't know the meaning of words. She's done that since she was learning to talk. She keeps us on our toes - and growing up too quickly.