party animal

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party animal (plural party animals)

1. (idiomatic) A person known for frequent, enthusiastic attendance at parties, especially one whose partying behavior is exuberant or excessive.
   • 1987 October 19, R. Z. Sheppard, “Yuppie Lit: Publicize or Perish”, in Time:

     . . . Tad Allagash, a stripling adman and Manhattan party animal with inexhaustible supplies of Bolivian Marching Powder (coy for cocaine).

• life of the party, carouser, reveller