completley on topic, as there MIGHT be article about that.   

  
 :According to J. E. Lighter's Historical Dictionary of American Slang, fucking-A can mean: 1.a. yes indeed or absolutely (correct); 1.b. (used to express astonishment, dismay, or recognition); 1.c. splendid; 2.a. (especially in military slang) fucking or goddamned; 2.b. (especially in military slang) fucking well or very well or very. 

 :The origin of the term is unknown, "perh[aps] abstracted fr[om] a phr[ase] such as 'you're fucking A-number-one right!'" 

 :For further fuck-related vocabulary, check out the book The F-Word, edited by Jesse Sheidlower (ISBN 978-0571197309), based on Lighter's work.