A mythical castle located somewhere in Orange County, California. It is rumored that the king of porn resides in this gilded palace of fucking. The place where all your porn dreams come true.
Bob: I have searched forty years for Fuckingham Palace, but have yet to find it. But I will search on!
Distinguished from the phrase, Fuckin' A, fuckina is one word with the short vowel sound on the a (uh)...usually dragged out a little.....Fuckinuh
I literally here this every day...Almost everyone I know says fuckina....
It is used as an adjective, as when someone says, "Let me have that fuckin' 1/2 inch socket" only they need a second to determine exactly what they want to say...."Let me have that fuckina 1/2 inch socket."
Another example, "I gotta get one of those new fuckina Samsung Galaxy phones."