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Longman Dictionary of Contemporary English
tailgate party
noun
EXAMPLES FROM CORPUS
▪ But the reed-slayers declared victory Sunday with a tailgate party celebrating the removal of an estimated 165 tons of the plant.
▪ It's called a tailgate party.
Wiktionary
tailgate party

n. A celebration, held in a parking lot, with picnic food served out of the back of automobiles or pickup trucks.

Wikipedia
Tailgate party

A tailgate party is a social event held on and around the open tailgate of a vehicle. Tailgating, which originated in the United States, often involves consuming alcoholic beverages and grilling food. Tailgate parties occur in the parking lots at stadiums and arenas, before and occasionally after games and concerts. People attending such a party are said to be 'tailgating'. Many people participate even if their vehicles do not have tailgates. Tailgate parties also involve people bringing their own alcoholic beverages, barbecues, food etc. which is sampled and shared among fans attending the tailgate. Tailgates are intended to be non-commercial events, so selling items to the fans is frowned upon.

Tailgate parties have spread to the pre-game festivities at sporting events besides football, such as basketball, hockey, soccer, and baseball, and also occur at non-sporting events such as weddings, barbecues, and concerts.

Tailgate Party (album)

Tailgate Party is an album by American comedian Larry the Cable Guy. It was released by Warner Bros. Records on September 22, 2009. The album peaked at number 1 on the Billboard Top Comedy Albums chart.