Shit-ton, despite sounding like a measure of mass, is actually a measure of volume. In other words - a shit-ton is the volume occupied by a ton (mass) of shit.
(On a tour of a brewery) "On our left, we have our primary fermenters. Each fermenter has the capacity of 2.3 shit-tons, which is equivalent to the amount of beer drunk every second in the United States"
27👍 5👎