"EVOI"

[Latin] - The ecstatic scream of joy of the Maenads.

Maenads (Bacchantes)

In Greek mythology, Maenads were the female followers of Bacchus.  Their name literally translates as "raving ones".  The Maenads were inspired by Bacchus into a state of ecstatic frenzy, through a combination of dancing and drunken intoxication.  In this state they would lose all self control, begin shouting excitedly "Evoi, Evoi" and engage in uncontrolled sexual behaviour.  They bore a staff (Thyrsos), crowned with ivy, wore the skin of a panther and put snakes over their locks.

Bacchus (Dionysus)

The Roman and Greek God of wine, fertlity and growth.  Also known as the Liberator, he freed oneself from their normal self, by madness, ecstasy or wine.  Bacchus was the son of Zeus and the mortal Semele.  The divine mission of Bacchus was to mingle the music of the Aulos and to bring an end to care and worry. 

Satyr 

The Satyrs were the male companions of Bacchus.  Satyrs are roguish, subversive and dangerous, yet shy.  They are lovers of wine and women and love to dance with the Nymphs.  Satyrs are strongly built with flat noses, large pointed ears, long curly hair, and full beards, with wreaths of vine circling their balding heads.  In later literature, they acquired a goat like aspect.