"You Can't Kill a Dead Man!" Is a popular martyr used in popular online video games. The Player has a key bound to kill themselves and at the same time say "You Can't Kill a Dead Man!". A Tactic used to piss off the opposing team, so they won't get the point for the kill, although in most games the person using it gets a suicide kill count, deducting a kill from their scores and adding a death.
Invented by the *Ünhi clan in 2003.
*guy 1 shoots at guy 2 almost killing him*
Guy 2: YOU CAN'T KILL A DEAD MAN! *Dies*
Guy 1: Fuck you you're so gay!