Kacke in the ass
You take a big dump right in your own ass. Your pants are soaked in poop. Everyone around you is laughing like idiots.
My cousin did a Kacke in the ass during lunch. The whole cafeteria started a food fight.
My dog did a Kacke in the ass on my mom's couch. She screamed like a banshee.
I did a Kacke in the ass during my math test. The teacher gave me a D for being a mess.