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1.
4TW
For teh win or For the win

Basically, gamers would say "You need to make Photon Cannons for the win!"
After a while, it would become sarcastic as in "MASS HUNTS FOR TEH WIN!!!"
And later, anything would be for the win:
"OMG SPAM THAT FORUM 4TW"
"I MASS WYVERNS 4TW"
"I SPAMMED goatse 4TW"
by iopq January 22, 2005
 
2.
4tw
gamer slang, used mostly on off topic forums for blizz games

a) it literally means for teh win

b) something cool
a) mass huntz 4tw

b) "Hellbourne!" "4tw"
by Hellbourne March 22, 2005