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."
by Nick D November 24, 2003
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.
by Migaspin September 21, 2021
Attempting to copy or steal someone's idea or mannerism.
He's wearing a red hat like I do, he's taking a page out of my book .
by Boston Travis September 4, 2007
When someone tries to do the same things you do.
He is wearing the same hat I do. He's taking page out of my book
by Boston Travis September 18, 2007
originated from the phrase, "My dicks got boogers". The phrase was then modified for unknown reasons. Mostly used in the Northeast. Probably referencing some kind of STD or genitalia-oozing ailment.
Yo sun sun, i can't believe my books got diggers, I gotta get that shit taken care of, that damn filthy snailtrail.
by Traser2g May 12, 2006
As seen in the movie Casino:

1. A poorly-crafted attempt to divert suspicion, despite obvious guilt.

2. Attempting to flee a bad situation with an ill-conceived method of escape.
"Little Craps figures--very nice, thank you very much, Mr. Piscano..."
"Those are my mother's books!"
by cDubs October 16, 2016