Dio: Aight... bring some Ciroc & red bull.
E: No need for the red bull. Once I get a hit of the casino air, I'll be good to go.
The "rush" that many people feel when entering a casino is really a combination of overstimulation (flashing lights, noise, excitement) and sudden exposure to lower temperatures; though they aren't allowed to pump oxygen in, some casinos keep temperatures lower than normal to help keep people awake and alert, spending more money rather than returning to their rooms.
Although it's based on false information, the term is not obsolete; it can also refer to the casino's atmosphere of excitement and risk.