1 definition by Katie Delaney

Top Definition
Means cool or awesome.

How was it Originated?

While text messaging, when you hit 2665 (trying to say cool) it will come out as book.
"Thats book, yo!"

"Book? You mean cool right?"

"Ya. LOL. thats COOL, yo."
by Katie Delaney January 25, 2008

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