Here is the urbandictionary.com submission I just made for the "Kentucky Waterfall"...
[photo courtesy of Matt]The ultimate in hair-styling excellence. Classic business in the front look transitions gracefully into a party in the back waterfall, Kentucky style. Usually accompanied by Little E t-shirt, jean shorts, conviction record, beaten wife, and no more than 9 teeth.
Not to be confused with the Kentucky Virgin, though the two are not mutually exclusive.
Example: The front of my Kentucky Waterfall says I work at the local Sunoco, but the back says I am addicted to meth.
Source: Charley West, Charleston