"WTB <Stuff>, Big Amounts!"
The phrase itself is widely known within the playerbase and is connected to a player named "Mabus". The reference in general, tough, also describes the behaviour of players who "scream" about buying or selling stuff within protected cities (mostly NCR) or IRC. While in most MMO's something like this is happening in a way that players dont really have to listen to it, it can be kind of annoying in FOnline.