Like other online communities, Roblox uses common internet slang and slang exclusive to the community. These are words commonly used in the Roblox community, including slang.
BA - Bad Alien. Since a Roblox administrator accidentally called Alan ( JacksSmirkingRevenge) "Alien", this abbreviation was in popular use during TNL Twitch live streams. It has since fallen out of use and is rarely used. Banned forever - Termination of a Roblox account, phrase popularized by Roblox YouTuber Faave.
Camper - a term used in Roblox FPS games, mostly Murder Mystery 2, It means when a player stays in one spot and waits for players/enemies to walk past him/her before attacking. DD - Dishonorably discharged. Mainly used in military roleplay games, it means that a player has been demoted or told to leave.