Machinia was a planet, notable for being the home world of Machinian and the home of PUP.
Machinia effectively looked like a gigantic scrapyard, being composed entirely out of pieces of scrap metal held together and maintained by the Machinian race. After the last member of the race died, the planet collapsed into a black hole.
The refrigerator Meow discovered on Machinia is a reference to the Cowboy Bebop episode "Toys in the Attic," in-which the cast are attacked by a toxic blob formed from long-expired food in a forgotten fridge. The appliance is eventually jettisoned into space.
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