leechers are people that stalk you e.g . you go into a game with a mod menu , you leave an they join your game that is 1 example of a leech

e.g.2 topics with mods or menu's 10th lobby all challenges ect post gamertag "inv me _____" with out contibuting

and so forth

Invalid_Username wrote i pretty sure its a type of bug and kills people

a leech doesn't kill people retard :facepalm: it just sucks their blood until there full then they drop off and move on