A Skumship, specifically the one GWAR steals from the Destructos.
The Skumship is a standard-issue starship used by the space pirates, the Scumdogs of the Universe.
GWAR steals a Skumship (pictured) from the Destructos during Lust in Space. With it, they finally escape Earth after numerous failed efforts.
The ship is once again mentioned on the album Bloody Pit of Horror.