When a chat room allows its users to complete a partially spelled screen name by pressing the tab button on your computer, mistakes can be made if several people have similer screen names. This is known as a tab pwn.
Robo_Catz: Mufter_the_King: Mufter_the_King is uber dumm
Mufter_the_Queen: Sorry, tab pwn, I think Robo_Catz was talking to me.
A commonly used DeviantArt daMN term colloquially used to describe an effective way of addressing the username without typing it out. It is more commonly used addressing the wrong user however.
~kitty9390: It's a pain typing out your username.
=Senor-Captain-Red-Wing29387: Just type "Se" and hit tab.
** `SeeMyHeartBleedBlack288 has entered **
~kitty9390: SeeMyHeartBleedBlack288: Thanks. XD
~kitty9390: Blargh?! I got tab-pwned! D<
None of the actual usernames exist...at least not to my knowledge. Anything else is completely coincidental and unintentional.