tailgate

Short definition from Wiktionary

Noun

1. 1
   A hinged board or hatch at the rear of a vehicle that can be lowered for loading and unloading.
2. 2
   The hinged rear door of a hatchback.
3. 3
   Either of the downstream gates in a canal lock.
4. 4
   Ellipsis of tailgate party.
5. 5
   A tunnel for drawing spent air away from the working face of a mine.

Verb

1. 1
   To drive dangerously close behind another vehicle.
2. 2
   To follow another person through access control on their access, rather than on one’s own credentials, especially when entering a door controlled by a card reader.
3. 3
   To privately purchase or sell a security immediately after trading in the same security for a client.
4. 4
   To have a tailgate party.

Proper noun

1. 1
   Synonym of Monicagate.