The act of cutting or docking an animal's tail short, or the practice of driving a truck without a trailer attached.
From bobtail as a verb; in modern trucking terminology, 'bobtailing' refers to operating a semi-truck without its cargo trailer, derived from the appearance of a shortened truck resembling a bobtailed animal.
In trucking, a 'bobtail' truck is actually less fuel-efficient and harder to control because the weight distribution changes—so truckers bobtail only when necessary, but the word perfectly captures how it looks like an animal with its tail cut off!
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