Prince Of Darkness:
another name for Satan


shimmy:
1 [short for shimmy-shake] : a jazz dance characterized by a shaking of the body from the shoulders down
2 : an abnormal vibration especially in the front wheels of a motor vehicle


Exodus:
Etymology: Latin, from Greek Exodos, literally, road out, from ex- + hodos road
1 capitalized : the mainly narrative second book of canonical Jewish and Christian Scripture
2 : a mass departure
* webmistress' note: I'm not sure how this fits into the song within the context of the lyrics


squire:
Etymology: Middle English squier, from Old French esquier -- more at ESQUIRE
1 : a shield bearer or armor bearer of a knight
2 a : a male attendant especially on a great personage b : a man who devotedly attends a lady