Up dog

Ryan brought home a joke from work the other day and was so excited to try it out on the boys. It goes like this:

The first person says: "Man, it smells like up dog in here."

Then the other person responds: "What's up dog?"

The boys thought it was so clever and funny. They tried it on each other even after they knew the punchline and they would laugh and laugh. They tried it on Grandpa and all the neighbors. It was the best joke to hit our house since either of them were born.

So, today we were in the van coming home from errands and Tyler turned to Olivia and said, "I think it smells like up dog in here." She very matter of factly responded, "Me too." I wonder what she was smelling that she was calling 'up dog'.