bac ‧ cha ‧ na ‧ li ‧ an BrE AmE , Bacchanalian /ˌbækəˈneɪliən◂/ adjective literary
[ Date: 1500-1600 ; Language: Latin ; Origin: bacchanalis 'of Bacchus' ]
a bacchanalian party involves a lot of alcohol, sex, and uncontrolled behaviour:
a bacchanalian orgy