Tailgate (verb)

1. Drive too close to the vehicle in front, especially in heavy traffic.
2. Open and lower the tailgate of a vehicle, typically a pickup truck or SUV, to use as a platform for seating, eating, or other activities while parked.

Origin:

Early 20th century: of unknown origin.

Examples:

1. He was tailgating the car in front, so I had to brake suddenly.
2. The driver was tailgating me and it made me feel unsafe.
3. The tailgating caused a traffic jam on the highway.
4. We tailgated before the game and had a great time with friends and family.
5. The tailgating party was a great way to start the game day.