An imaginary list of persons or groups who are held in high regard by a particular individual. Often used in reference to whenever someone gains a more favorable impression of another.
I never really liked Bob in the past, but when he stuck up for me the other day I put him in my cool book.
by reverendmagus March 22, 2008

technically means extremely or very cool, but most people who say it never just say cool, so its pretty much useless, unless you can use it with moderation.
guy1: lol, i just totally ownage pwnd these n00bs.
guy2: thats so uber cool, you should kill yourself.
guy2: thats so uber cool, you should kill yourself.
by harlan entler May 3, 2005

another way of saying "cya later homies" the next gangsta word coming out, already used by DMX and Usher
Suraj says, " yo, I have to go hit it on the street"
Patricia says " alright man, cya later"
Suraj says, " ya girl, stay cool !!"
Patricia says " alright man, cya later"
Suraj says, " ya girl, stay cool !!"
by Suraj Bhakta July 28, 2006

by very_unoriginal December 15, 2010

Tre Cool is the amazing drummer of Green Day. Born Frank Edwin Wright III, Tre joined the band when the original drummer left. Tre collects drumkits and plays like thunder. He has the energy of a bee, the speed of a cheetah and the rage of a rabid dog. Probably.
by The Lilac Pilgrim November 7, 2004

by SSmith October 29, 2005

by ya yayo January 16, 2008
