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."