an exhaust pipe located at the rear of a motor vehicle or aircraft powered by an internal-combustion engine.
Also, tail pipe.

1880–85, in sense, “suction pipe of a pump”; 1905–10 for current sense; tail1 + pipe1

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World English Dictionary
tailpipe (ˈteɪlˌpaɪp)
a pipe from which the exhaust gases from an internal-combustion engine are discharged, esp the terminal pipe of the exhaust system of a motor vehicle

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Example sentences
There's no tailpipe sticking out of the back of your laptop.
It consumes no gas, releases zero-emissions from its tailpipe, and has lots of
  high torque for a zippy pick-up on the road.
When this trio first pulled into view on the track, they looked conventional
  except for one telling detail: the tailpipe.
Her work ranges from the noxious tailpipe to the precancerous cell, evaluating
  all the possible way stations of disease.
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