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.
A Player who in one form or another intentionally kills or wounds members of his own team during gameplay.
A team killer (or TKer) is a player who intentionally attacks and kills his or her own teammates in a multiplayer computer game. Team killers are scorned by most gamers. Since many team kills are accidental, the term team killer is usually reserved for those that repeatedly or deliberately TK.