[steveklabnik]

For extra context, this was (originally, I think) used on /. because people would comment without reading the articles. The 'fucking' is used to communicate annoyance that it wasn't read in the first place.

An example, for this article:

OP: "Yeah, there's a lot to be thankful for, but I get delayed out of SFO because of fog almost every flight."

Reply: "TFA actually has a chart that shows that flight delays due to weather are not a problem, at least compared to other cities."

[benologist]

Urban Dictionary agrees with /. as the source but derived from RTFM -> RTFA -> TFA which makes sense:

http://www.urbandictionary.com/define.php?term=TFA