tailgatePronunciation: /ˈteɪlgeɪt/Translate tailgate | into French | into German | into Italian Definition of tailgate noun a hinged flap at the back of a truck which may be lowered or removed when loading or unloading the vehicle. the door at the back of an estate or hatchback car. [as modifier] North American relating to or denoting an informal meal served from the back of a parked vehicle:a tailgate picnic [as modifier] denoting a style of jazz trombone playing characterized by improvisation in the manner of the early New Orleans musicians. verb [with object] informal drive too closely behind (another vehicle):he started tailgating the motorist in frontDerivatives tailgater noun tailgate in other Oxford dictionaries Definition of tailgate in the US English dictionary