You’re actually not being ignorant when you call something a buttload, now it’s time to school your friends. Although it does not relate to any specific measurement it can be a great conversation topic at a bar. A butt is a unit of measurement when referring to a cask that holds wine or whiskey.
A cask, in simpler terms, is a container typically made from wood, metal, or plastic in a barrel-shape meant to age fine alcohol. These barrels come in different sizes depending on the distillery/winery and the amount of alcohol they carry. A butt is the second to largest sized cask and can hold a whopping 108 imperial gallons. To compare, a typical barrel holds a measly 36 gallons. Now that’s a big butt!
Unfortunately, these measurements are not too common in today’s culture. The imperial measurement system is based on a weight system that compared human weight to stones. Converting the numbers is basically impossible and formulas made no sense. But hey, at least the names are funny.