Team Killing
From EGN Wiki
A team killer (or TKer) is a player who intentionally attacks and kills his or her own teammates in an FPS computer game like Counter-Strike: Source.
This is only applicable when the friendly fire features of a game are enabled. Enabling them can sometimes make the game more realistic, which is desirable for competition matches, but not so for public play.
For your convenience, all EGN public servers have friendly fire switched off.
