(Adj.) 1) Portmanteau word formed from "fucking" & "ridiculous," describing something SO unreasonably absurd, that calling it "ridiculous" is far beyond inadequate for adjectival usage; or, 2) Through-the-looking-glass idiotic.
1) My landlord hasn't fixed the hot water for 5 days! That's just fuckdiculous!
2) That guy I REALLY hate at work used me for a reference when applying for his new job: that's fuckdiculous!
When you're too fucking mad to fucking come up with an actual fucking insult and fucking think for a fucking second so you just fucking fuck up your mind and fucking go full ham on someone and spit out this fucking fuckton of fucks in one breath which totally is garaunfuckingteed to fuck your motherfucking foe so fucking hard their eyeballs fucking gush out of their fucking organs which then fuck your foe into oblivion and fuck them over for motherfucking life.