Leeching
Reporting a teammate for leeching gives that player 2 dishonor points. If at least half of your team reports this player, a further penalty will be applied preventing any faction or XP gain in that match. If, however, a third or less of your team reports that player, you will also be given 2 dishonor points for issuing an unsupported report. Players with 10 or more dishonor points are temporarily prohibited from participating in PvP.
http://wiki.guildwars.com/wiki/Report