Aussie slang for a place that is a long way away and is usually not worth travelling to.
Tim: Are you going to Dave's party tomorrow?
Rob: Yeah I would but it's all the way out in bumfucknowhere so I can't be bothered.
another name for Bullengarook. A place in Australia
I had to go all the way out to Bumfucknowhere to visit the fire station.