I need to upgrade my dad schtick. My kids are 10 and 8 and getting past me saying "chicken butt" every time they say "guess what?"
I did getting them the other day when they were talking about our neighbor's new golden doodle puppy. They know I want our next dog to be a poodle mix due to the anti-shedding stuff (I'm constantly fighting dog hair from our lab, it's outrageous). Anyways, I told them that I'd been thinking about a Pekingese and Poodle mix and asked what they thought about that. They immediate took the bait and said, "What's that called". As deadpan as possible I said, "Oh, you know, that's a PeePoo." They laughed for a good minute and then tried to come up with their own scatological dog mix breeds for maybe 20 minutes.
Anyways, bathroom humor is currently a homerun with them, so any related schtick appropriate for girls there age, I'd love to hear/steal it.