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1.
A conjunction of the words shithole and dump. Usually referring to a location but can also be applied to persons or things.

As a location this defines a place so hideous, boring and/or inhospitable it will not suffice to refer to is by either a shithole or a dump - it is thereby a shitdump

In reference to a person or thing it is someone/something who/that is unsanitary, foul, wretched or otherwise inequitably loathsome.

Can also be used an adjective.
Location: Man this place smells like dog-ass marinated with fermented fish carcass - What a shitdump!

Person: Dude, I don't think that guy's bathed since soap was invented - He's such a shitdump.

Thing: That piece of "art" looks like Salvador Dali loosely defecated a sculpture of Andre the Giant - What a shitdump!

Adjective: That's such a shitdump idea; Benicia, oh that shitdump town in California?; What's up with that shitdump jacket?
by Saul T. Nuhtz September 24, 2010
 
2.
when something is really cool.
This shit duuumps!

That girls jaket is shit dumps!
by ceara, dezi and erin November 27, 2007