IPA: /ɔːrˈdʒɪəstɪkli/
KK: /ɔrˈdʒiːəstɪkli/
In a way that is wild, excessive, or characterized by unrestrained celebration or pleasure.
The crowd danced orgiastically at the festival, losing themselves in the music and joy.
Orgastically → It is formed from "orgiast" (from Greek "orgia", meaning secret rites or festivals) and the suffix "-ically" (meaning in a manner relating to). The word "orgiastically" refers to something done in a manner relating to or characteristic of orgiastic rites or celebrations.
Think of the Greek word for secret rites ('orgia') to remember that 'orgiastically' describes actions done in a manner related to those festive and uninhibited celebrations.