A butt crack of a male or female that is extra long. Almost appearing to start at the lower back. When one observes Sir Long Crack one must sing the Sir Long Crack Tune,

Sir Long Crack, Sir Long Crack, the most wonderful crack around,

Sir Long Crack, Sir Long Crack, the longest crack in town.
Sir Long Crack is protruding from the top of your trousers.
by Big Juice Boy November 23, 2021
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