Found this on the online urbandictionary.com-

"The last half inch thrust during doggy style sex. This involves thrusting forcefully with your pelvis and perching up on your toes in order to look like a crowing rooster. It occurs right before ejaculation or to fuck a gay man straight."

http://www.urbandictionary.com/define.php?term=rooster

Seems to be an inner city term. Usage there changes and evolves rapidly.