Definitions for "Team Killer"
Someone who repeatedly shoots members of their own team. Players doing this on purpose are often booted or kicked from games. TEAM: The side you are assigned to or join in a team based game such as SOCOM, Tribes or Hardware.
Someone who repeatedly attacks members of their own team. It's usually forgivable to shoot a teammate by accident once or twice, but players who deliberately do this should be booted by the Host.
A player who repeatedly shoots members of their own team. Once or twice can be accidental, but more than that and other players will feel it's deliberate. Players doing this on purpose are often 'booted' from games.