A trip to Las Vegas, NV in which you are there for less than 24 hours.
Usually only achieved by those residing within a few hours drive of Las Vegas (California, Arizona, Nevada) or those with money to spend on flights.
Though a hotel may be booked for a Vegas 24, it is not a necessity and will likely remain unused.
Also referred to as a Vegas Turn-Around.
You: "Hey, I'm bored. Wednesday nights are boring."
Friend: "I know. Me too. Let's do a Vegas 24."