Fuckin' A means: 'Absolutely'. Or 'Damn straight'. To make the same statement, Aussies say "Bloody Oath" (or maybe 'kern Oath' if my sources are correct). There is no need to parse it to try to figure out what the 'A' means. It just is. All this 'awesome' and 'can be either positive or negative' comment is crap.
by A California Native October 5, 2010
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"Fuckin' Awesome"

Can be said in good or bad context to indicate a positive or negative reaction (respectively), but no matter how it's used... it still means "Fuckin' Awesome"
1) -Holy shit! I passed English!
-Fuckin A, man!

2)Fuckin A, I can't believe I won.

3)Fuckin' A!... somebody finally wrote a decent definition for "fuckin' A"
by wobblyheadeddann April 1, 2006
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"fucking affirmative" derived from military radio communication. One would say affirmative but in the heat of battle "fucking affirmative" then "fuckin a"
by creamy love sausage March 10, 2009
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A useful phrase when a friendly conversation has reached a lull.
"-so I told you that bitch was crazy..but...fuckin...you goin' to the club tonight?"
by Anonymous September 2, 2003
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"Is that your car?"
"Fuckin-a! Isn't it sweet?"
by Kitsa March 30, 2003
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An expression of enthusiasm and agreement: short for fuckin' ABSOLUTELY.
"After the final, we should grab a couple sixers and some herb and stop by the Delta house."
"Fuckin' a, man, fuckin' a.
by Ben Frey November 25, 2005
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Actually I heard it was New Jerseyan for "Indeed!".
Man from Jersey: "Fuckin A!"
by Iris November 11, 2003
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