It means "home" in Icelandic, and is the most recent creation from the band Sigur Ros. I watched it with some friends the other night while enjoying a homemade peasant-style fish stew, some crusty bread and cold butter, and equally cold vodka. (I'm all about the full-blown, multi-sensory experience.)
Check it out, and see it if possible (you'll have to order and own it, just know that.) It's staggeringly, painfully, heart-swellingly beautiful. http://www.heimafilm.com/