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."