Man Water

So a few nights ago, we were all hanging out as a family in the kitchen. Hunter was just in a shirt and underwear. Sometime during the evening, I noticed the front of his underwear had a yellow spot on it.
Me: "Hunter, did you have an accident?"
Hunter: "No Mom."
Carly: "Don't worry mom, it's just Man Water..."
Dan and I looked at each other and burst out laughing. Man Water!!! Where does she come up with this stuff?!?