warhammer 40k (gamesworkshop) universe space marine chapter, this chapter was created to fight the forces of chaos chapter 666
the grey knights fought off hords of chaos deamons
by OutLaw92 November 01, 2008
1 more definition
Someone who defends an unknown person who has been warned or punished by a moderator especially when the reprimand was deserved but the grey knight feels the need to stick up for him regardless.
When the moderator warned a player for shouting racist insults over his mic a grey knight kindly told the moderator to chill out.
by joeybelfort June 26, 2012