An adjective used to describe anyone or anything too cool to be just cool. Only to be used in the most extraordinary of situations. Consequently, any misuse of this term results in immediate banishment from the society the abuser had come to know and to love.
Person 1: You know that Person 4?
Person 2: Yeah, he's a pretty cool guy.
Person 3 (ambling into conversation randomly): He's more than just cool, he's coot!
Persons 1 and 2 (in perfect unison, shocked): Gasp! You're right!