If we’re talking imperial measurements, a “butt” is a cask of liquid. And while this form of “butt” is obsolete for most people, it’s still used in wine and brewing contexts. In the wine world, a butt is around 108 imperial gallons (just under 500 liters, or around 126 U.S. gallons), so it turns out that a buttload is… a buttload
https://www.interestingfacts.com/facts-to-make-you-laugh/ZGLzx90vtAAIdfYO
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