OBC

OBC means Outrageous Builders Club in Roblox, which is the highest level Builder ppl in the game. Whoever bought it is totally super rich.

Robloxian1: Hey, check it out. I got BC!
Robloxian2: Well... check me out , I got OBC dude!
Robloxian1: OMG! You must be super rich yo!

TBC

It means Turbo Builders Club in Roblox, it's also the second-highest Builder ppl in Roblox.

DanTDM: hey dude wanna check out mah BC?
Spectre2.0: No need u better check out mine first dude.
DanTDM: OMG! ur so rich! u got TBC?!
Spectre2.0: yep
DanTDM: I wish i had that too but... i just want to save some money for mah robux
Spectre2.0: no wonder u got moar robux than meh in the moment...
Me: XD I HAVE NONE BC TBCOR OBC AT ALLLLLLLL! TROLOLOLOLOLOLOLOLOLOLOLOLOLOL