It basically means "obviously". Similar to the phrase "Does a bear shit in the woods" or "Is the Pope Catholic" or "Is Snakes on a Plane the best movie ever"
If this definition is unclear, see Man vs. Beast 2 on the Fox Network.
A congregation of young girls and typical prostitots dressed like skanks and grinding all over the nearest moving male. Examples include middle school dances and underage clubs as well as bar and batmitvahs