tailpipe

noun

1. An exhaust pipe exhausting to the aft of the vehicle.

   “Holonym: exhaust system”

   “This car doesn't have a tailpipe because it has sidepipes instead.”

2. (US, especially)An exhaust pipe (on a vehicle) (in any configuration).

   “Today's cars emit less NoX at the tailpipe than their 20th-century predecessors did.”

verb

1. (transitive)To fasten an object to the tail of (an animal) as a prank.