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party bus

n. A bus, often, a converted school bus, or other large vehicle used to transport large numbers of people to strip clubs, taverns and other party spots.

Wikipedia
Party bus

A party bus (also known as a party ride, limo bus, limousine bus, party van, or luxury bus) is a large motor vehicle usually derived from a conventional bus or coach, but modified and designed to carry 10 or more people for recreational purposes generally involving some kind of celebration, such as a birthday or graduation. Party buses are usually driven by chauffeurs.