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Noun: gatecrasher  'geyt,kra-shu(r)
  1. Someone who gets in (to a party) without an invitation or without paying
    "The gatecrasher slipped past security and enjoyed the exclusive event";
    - crasher [informal], unwelcome guest

Derived forms: gatecrashers

Type of: interloper, intruder, trespasser

Encyclopedia: Gatecrasher