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1.
A Roblox Guest could be an online player that is new to the game and wants to try out the game first before making an account..

Or, a person who already has an account, but wants to piss people off in a certain game without getting their original accounts banned.

That might by why regular Roblox players chew out Roblox Guests, and be mean to them. But pretty much both types piss the people of Roblox off.

They cannot talk with whatever words they want in public games. They can only talk with a pop up menu chat.
Their appearance also changes when the user, Roblox, changes their appearance. Which.. rarely happens.
Player 1: WTF THE ROBLOX GUEST SPAWNKILLED ME!
Guest: OMGLOLEPICWIN!UBERHAX0RZAGE!!!@#!%one!!11
by JellyDinosaur July 27, 2010