I know it like the back of my ass
a phrase for knowing something so bad it’s like you were born with a dirty sock stuck to your ass. most people are too embarrassed to look at their own ass.
I know this movie like the back of my ass. I’ve watched it so much I can quote it in my sleep and still get it wrong.
My boss said he knows my mistakes like the back of my ass. He’s never seen my mistakes.
I know this place like the back of my ass. I’ve been here every day and I still don’t know where the bathroom is.