When you’re taking a shit and are able to break the log off without leaving any shit residue behind on your asshole.
“Damn, I had a clean breaker! I didn’t need to use any toilet paper at all!”
Or
“Man, I wasn’t able to shit the whole log out before I broke it off and now I have shit on my asshole. I was hoping for a clean breaker but now I’m gonna have to wipe my asshole a lot!”