in my book 

When something is according to your beliefs and ideals. Same as in my opinion

Person 1: Is being a bookworm cool?
Person 2: It is in my book.

in my book by Migaspin September 21, 2021

Aces in my book 

someone who you would always put in the first place

She's the aces in my book.

Aces in my book by kckhlc March 6, 2010

not in my book 

1) that is not true, according to my morals, principles, and beliefs
2) in a place other than the bound collection of literature that belongs to me or rests in my hand

1)
Cop: "Oh man, what a hard day of busting drug dealers it's been. A big fat J would really hit the spot right now. Can I borrow some papers?"
Your square ass: "Isn't that...um...illegal? Smoking marijuana, I mean?"
Cop: "Not in my book. Bitch."

2)
"Damn, a playa really needs to take a piss after those 10 beers I just had. Over here would be a good spot."
"Oh shit!!!! Not in my book!!!"
"Whoops, sorry about that."

not in my book by Nick D November 24, 2003