Adj- A word given to describe the emotion between "Fuck", and "Fantastic". Usually used sarcasticly in situations where things are far less the fantastic.
Jeremy: Did you know the whore is with him now, but STILL flirts with me?
Emily: Yeah, I heard.... FANFUCKINTASTIC.
Jeremy: Yep, dumb bitch.
Guy 1 gets fired, is kicked out of flat for not paying rent, gets pissed and is arrested for being D&D, then partner breaks up with him; "That's just fanfuckintastic"