This expression is a derivation of the french expression "I know this place like my pocket" which is an equivalent of " I know this place like the back of my hand" meaning that a person knows really well a place.
Works better if you are french or a baker.
-Do you know where we are?
-Yeah of course. I know this place like I know my baguette.
The perfect thing to say when you haven't been listening to a conversation that you started. This works for an answer to virtually any question. Perfect for answering if you can't hear the speaker in a crowded, loud room.
Friend: "So how've you been lately? Any better?"
You: "WHAT?"
Friend: "I said, HOW'VE YOU BEEN?"
You: (panicking) "Oh, uh...I don't know, man, it's just like...I don't know, ya know?"
Friend: "Yeah, totally."
Now if you like a boy and you might be a girl or a boy and you are unsure how they feel a lot of people understand. Now the best way to deal with this is to get to know him better, get to know about his sexuality and how he deals with situations like in relationships. If he deals with them well and he flirts with you, you're in! But if he shows no interest in you or asks you for pics, drop him! He ain’t worth it!
phrase.
refers to an unknown area. the opposite of the common phrase "i know it like the back of my hand". Originates from the fact that most people (unless they are porn actors/models) are quite unfamiliar with the backs of their asses.
Joey: oh look that chick lives in Ismay, Montana. I know that place like the back of my hand. I'll get laid for sure!
Tommy: shit, I know it like the back of my ass.
(walks away defeated...)