I thought 'fuck' was an abbreviation for, fornication under the command of the king' or something like that. Thought it dated back to a time in English history. Makes me wonder...
I think the use of the word varies greatly. During the 60's 'fuck' was used to puctuate almost any comment. In the States I heard the terms, fucked-up, fuckin' good, for fuck sake, etc.
When I moved to Canada, I heard (for the first time) fuck around!
It was usually used as a kind of "I'm bewildered" or "do you believe it?" comment. Seemed an odd expression even to one who was quite used to hearing street language.