orgiast
/ˈɔːdʒɪast/noun
A person who celebrates or attends orgies; (also more generally) a person given to excessive indulgence in something.
Origin
Late 18th century; earliest use found in The Spirit of the Public Journals. From Hellenistic Greek ὀργιαστής person who celebrates orgies from ὀργιάζειν to celebrate orgies + -της, suffix forming agent nouns.