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."