Thanks For Asking

The fucking article. Often used in the construct RTFA (read the fucking article), itself derived from RTFM, it is often used on the slashdot news site, where it is common knowledge that most of the posters will comment on stories without reading the articles linked to in the main story.

Two Factor Authentication. Or Three Factor Authentication. (You see, there's ambiguity in the definition of this TLA)

In most situation, you only need a single factor to authenticate, to prove who you are: "Something you know" - typically a password. But that's not very secure. Therefore, some systems make authentication stronger by requiring more than just one factor. Other factors are "something you are" (such as your fingerprint, or other biometric aspects such as your signature) and "something you have" (such as a key, or a chipcard).

Total Fuckin Asshole

titty fucking action

tfa is just a abreviation for the fucking asshole. Most likley created by some computer nerd who was getting tired of typing.

TFA stands for Teach for America. Teach For America is a national corps of recent college graduates and young professionals of all academic majors, career interests, and professional backgrounds who commit two years to teach in urban and rural public schools and become leaders in the effort to expand educational opportunity.
Its mission is to enlist the nation's most promising future leaders in the movement to eliminate educational inequality.