partier

noun2

1. •
   One who parties; a person who attends a party or other lively gathering.
2. •
   (slang) One who takes part in "party and play" activity, combining sex and recreational drugs.

   • Almost one third of lesbians and gay men are addicted to drugs. […] I don't ascribe bad intent, but as I walk through the last stumbling, mumbling partiers at the end of gay prides, I think […] — 2007