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One who attends a party without having been invited. I don't mind party crashers coming to my parties, so long as they behave themselves.
One who attends an event, such as a concert, sports match, or party, without being invited or paying to get in. I don't mind gatecrashers coming to my parties, so long as they behave themselves. Due to the popularity of the show—and the limited amount of tickets—extra security was hired to keep any gatecrashers out of the concert.
n. a person who attends a party uninvited. (see also crash.) The crashers ruined the party, and my dad called the cops.