Usually bestowed by drunken girlfriends riding upon the shoulders of their boyfriends at concerts while shouting "Wooooo!" with so much gusto that they momentarily lose the grip of their sphincter, releasing a torrent of the previous night's Taco Bell visit down the gentleman's back - much like a chocolate rooster tail.
Mark bent over the back of a chair by the door after a self administered enema, anus pointed eye level, waiting for Kyle to open the door so he could chocolate rooster tail him.