A distant cousin to the Cleveland Steamer, the Purdy's Wharf is accomplished by having anal sex with a fat chick, then peeing on her bed while she is in the bathroom "cleaning up".
The Wharf Rats are a sub-group of Deadheads who are drug and alcohol free. Predominantly recovering alcoholics and or drug abusers. From the Jerry Garcia/Robert Hunter song "Wharf Rat" about a down and out wino hanging around the docks of San Francisco.