What does your butt do?

Talia: "My butt is cracking up!
Sonja: "Your butt is cracking up?"
Talia: "Yep!"
Sonja: "Exactly what does that mean?"
Talia: "Duh. Butt cracks."

4/13/11 as we were running errands.  She always has a "wedgie" when she gets in her carseat.  Today, there was a little more going on down there!