Frickin' A, man!

Factual Questions
1

What does the “A” mean?

On a related note, we use the phrase “F you!”. How did it become like that: Verb, then you? For example, it’s “Go wash yourself”, not “Wash you”.

Ah, the etymology of swear words.

2

Already done.

http://boards.straightdope.com/sdmb/showthread.php?s=&threadid=64268&highlight=fucking
and
http://boards.straightdope.com/sdmb/showthread.php?s=&threadid=91613&highlight=fucking

NOthing conclusive.