Definition of bobtails:
(n) :
A short, or deliberately shortened tail.
(n) :
An animal that has a bobtail, such as certain canines or nags.
(n) :
The tractor unit of a semi-truck without a trailer.
(n) :
(agriculture) A tractor which performs without its trailer.
(n) :
A tractor-trailer that is relatively short in length.
(v) :
To drive a truck or other vehicle without its trailer.