Alcoholic beverages that you find in the trunk of your car because on a previous night, you were too cheap or poor to buy drinks at a bar or club. Often used by a creepy Irish guy to try to entice you to sleep with him. See pregaming.
Hey guys, I know youre going to the club tonight, ya want some fuckin trunk booze?
Hell yeah!!! My unemployment check didn't come in yet.
Alcohol used for pregaming that you keep in your trunk to drink in the parking lots of establishments when you're too broke to pay for drinks inside
"Hey guys, I know you're going out, ya want some trunk booze?"
"I'm pretty broke tonight... bring the trunk booze!"