What is Dark Water?
1.
A movie so shitty that its name has become an adjective meaning the worst possible kind of something.
Compaq is the Dark Water of computers.
2.
The worst movie ever made, in which absolutely nothing happens, although the entire movie soundtrack makes you think something is about to. Its name has become synonymus with describing the worst possible example of something.
George W. Bush is the Dark Water of US presidents.