babooning
When your butt is so sore and itchy from not wiping properly, you start scratching it like it's on fire and you're screaming in agony.
My butt was so bad from monkey butt, I had to scratch it for 10 minutes straight.
At lunch, I had such a bad case of monkey butt, I had to run out of the room.
My sister had monkey butt so bad, she started screaming in the middle of math class.