tailpipe /ˈteɪlpaɪp/noun 2verb 1forms 3 noun2 •An exhaust pipe exhausting to the aft of the vehicle.This car doesn't have a tailpipe because it has sidepipes instead. •(US) An exhaust pipe (on a vehicle) (in any configuration).Today's cars emit less NoX at the tailpipe than their 20th-century predecessors did. verb1 •To fasten an object to the tail of (an animal) as a prank. formstailpiped · tailpiping · tailpipes