A guest is a player of Roblox who has not yet created an account. In places, guests can do most of the things other users can do with the exception that they are locked in supersafe chat mode. Some users have made a script, where a supersafe chatter can speak, inculding the guest. Guests always look like ROBLOX (the player).
Alot of players refer to guests as 'noobish' for deleting, spawnkilling, and teamkilling. Players deem this especially annoying because they cannot report them, mainly due to the fact that reporting a guest doesn't work if the player clicks the report button and reports the guest, this is because the guest has not got a proper account, so therefore, no action can be taken against the guest.