It's an exclamation shouted right after stealing the basketball from the offense. It originated around 1991-1993 and was related to the cookie crisp commercial in which the cookie crook tried to steal cookies from the breakfast table while his dog sidekick screamed cooooooooookies.
A source of energy for some carbon-based life-form. It usually contains flour, sugar and some type of oil or fat. Sometimes, the carbon-based life-form so-called "grandmother" uses a method of cooking food that uses prolonged dry heat to produce cookies for their child's son and daughter.
Hey fellow mortal, do you want this energy source that contains flour and sugar that they call "cookies" that can cause "happiness" and "joy"?