Hell

"The Enrichment Center would like to reminds you that Droid Hell is indeed a real place, and you will be sent there at the first sign of defiance..."

- GLaDOS to C-3P0 as he leaves the factory

Hell meant different things to different people, beings and even droids, but pretty much everyone who acknowledged its existence regarded it as a bad place, where evil folks were punished for various transgressions. Sith Lords were among those who did not believe in Hell, which was why they felt so cavalier about doing the bad things that they did.