If it came from World of Warcraft (WOW) or not the only reason I can think would be when People in WOW had to have Master Loot on in instinces and the leader would go "Roll for X" 5, 4, 3, 2, 1, Done. Then they would say (persons name) For the win. Then "FTW" was a common phrase to say when something worked. Such as "Thats For the win" or "Dude, thats FTW"
I've never heard **** the world said on the computer, but quite a few times off the comp, but I think for the win had to do with the computer revolution when half the world basically had on, late 90's early 00's