Definitions by Sensini

koo 

The act of which the primary aim is to gain, regain or sustain social status, by partaking in an action that the individual perceives to be "cool".

Person A embarrasses Person B in front of Girl C that Person B is trying to impress/pull/shag etc.

(Hence being koo!)

Person B would then have licence to say: "Very Koo!"

koo by Sensini November 4, 2005