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1.
An exclamation used when anything, good OR bad happens.

There is never a bad time to use the phrase "Fuck'n A".
Guy: "Dude! I heard you copped some fatty dome from your friends mom last night! Good work!"
You: "Fuck'n A man, you know I did!"

or

Friend: "Bro, you sucked off a goat in a drunken rage last night... And you still got some skeet on your douche goggles..."
You: "AWWW, FUCK'N A why didn't you stop me?"
by =>mittens<= May 01, 2009
 
2.
Fucking nasty ass
"Man look at her, what a fuck na!"
by Christy January 15, 2003