It is the act of not wiping after defecation and leaving the excrement to fester on ones anus therefore hardening and turning into butthole cheese.
"Dude, you should wipe a lot more often!"
"Why?"
"Because your ass cheeks are caked in butthole cheese!"
"Why?"
"Because your ass cheeks are caked in butthole cheese!"
by Birch Guy December 02, 2014