I’ve lead a sheltered life so I’ve only ever encountered FTW on Twitter and in text messages and assumed it to mean WTF (What the F**k) backwards to emphasize some additional confusion mixed with exasperation.
It turns out the letters FTW actually stand for For The Win.
It seems the expression originated on a TV game show called Hollywood Squares in which the host would precede the winning question with “For the win…”
Here’s a clip in which the host John Davidson uses the expression (in the last minute of the video):
FTW – For The Win – Is used as an excited exclamation – although sometimes used in a sarcastic way.
Search YouTube for FTW and you’ll find lots of ‘how to’ videos.
What else could it mean? Another commonly accepted meaning:
F**k The World – When used in anger. How rude!!