A term that is used basically to tell someone to 'fuck off.' Instead of just plain old telling someone who is pissing you off to fuck off, tell them to go to Fuckity Off Land, which is no where near you.
A place you are told to go if you are severely pissing someone off.
Greg - 'Dude you smell soooo bad!'
Hope- 'Oh yeah?! Well you need to go to Fuckity Off Land!'