Janitor

Janitor is a derogatory multiplayer slang term for a player who waits until other playets are in the midst of fighting or after they have killed one another, then jumping in and "cleaning up" the remaining players who may have low shields or ammo and are easy targets for a fully equipped player.

The idea of "Janitoring" is most often used in game variants of slayer or other non-team games, where players do not cooperate actively to destroy another team. Though not specifically "cheating", janitoring takes advantage of other players distraction to try and kill them. Janitoring is a way to get easy kills, making awards such as the Double Kill or Triple Kill easier to obtain. It is looked down upon by other players and generally considered a "Newb" tactic.