bootbeer Share definition Flag Having a beer, or alcohol beverage, out of an esky, from the boot, or trunk of a car. Let's all have a bootbeer after our basketball game tonight. I've got a slab on ice. bootbeer by Hewy from Oz February 9, 2018 0 0 Get merch Get the bootbeer mug. Buy Now — $32.95 See more merch