Booze mining is the practice of hiding a quantity of alcohol (and/or drugs) before the security goes up for an outdoor festival (say, like Lollapalooza) by burying it on the grounds, often with a geotag on the location, and digging it up after the show starts.
"What're you doing there?"
~ "I'm digging up my booze, man!"
"Dude, I so thought booze mining was an Urban Legend!"
The act of driving a vehicle while drinking any sort of alcohol. Beer is the main accepted form of drinkage for such a trip. A booze cruise can be a trip to the woods with no authority and hitting the trails to just driving down a highway with a little beer.