A tailgate can refer to different things depending on the context. Here are the different meanings of tailgate:

• Vehicle Part: A tailgate is a board or gate at the rear of a vehicle that can be removed or let down for loading goods.
• Driving Behavior: Tailgating is a driving behavior where a driver follows another vehicle too closely, which is dangerous and can cause accidents.
• Social Event: A tailgate party is a social event held on and around the open tailgate of a vehicle. It is a pre-game party that usually takes place in the parking lot of a stadium, arena, or venue before an event starts. The party typically includes music, food, (alcoholic) beverages, and games to kick off what’s sure to be an unforgettable day. Tailgating is also known as pre-gaming, a warm-up for the main event. It’s a beloved tradition in North America that has even become a national holiday celebrated by 80% of the US.

In summary, a tailgate can refer to a vehicle part, a driving behavior, or a social event.