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a way of saying you know something so bad it’s like you were born with a map of it tattooed on your ass. most people don’t even know what their ass looks like, let alone the back of it.
Bro, I know this game like the back of my ass. I’ve lost more money than my mom lost weight.
My ex said she knew my problems like the back of my ass. She didn’t even know I had a problem.
I know this job like the back of my ass. I’ve been sitting here for 8 hours and I still don’t know what I’m doing.