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1.
Wtfpwn, v. - To pwn very hard, ostensibly to the point of making the pwnee say "wtf"
OMG ROFLZ!11 I wtfpwn j00 l4m3r!!!1
by Allen D May 03, 2004
 
2.
Beyond simple a simple pwn, "wtfpwn" means to pwn someone in a quick and decisive manner, such that they don't know what hit them and/or have little chance to react before dying.
My lvl 60 rogue stealth'ed and wtfpwn'ed those gray noobs.
by jky October 05, 2005
 
3.
To wtf pwn, is to completely and utterly destroy something in style, commonly used by "wtf 1337 cnuts" like fw.
"omg, i just got wtf pwnd :("

NOTICE: NO E IN PWND !
by FireWolf August 21, 2005
 
4.
Combination of WTF (What the fuck) and PWNS ('owns' in the sense of 'defeats', see: PWN). Used to describe a total victory over someone who didn't even stand a chance.
"The average gamer playing a first person shooter on a PC with keyboard and mouse wtfpwns the average gamer playing the same game on a XBox 360 with a gamepad."
by Tachyon May 10, 2007