What is Butt?

Legal Definition
A measure of capacity, equal to one hundred and eight gallons. See Measure.
-- Bouviers Law Dictionary
Legal Definition
A measure of liquid capacity, equal to one hundred and eight gallons; also a measure of land.
-- Black's Law Dictionary
Legal Definition
A ridge left in ploughing; an archery target; a measure of one hundred and ten gallons.
-- Ballentine's Law Dictionary