A combination of Randy from the UK: "horny" and Pandemonium a state of extreme disorder which combined are a state of sexual chaos.
It was the wildest sex I've ever had; sheer randemonium!
Dude 1: What did you do saturday night
Dude2: I was livin'the rad life the Helm saturday night, and there were hella bros, mexican cowboys, white trash dudes, trannys, punk rockers, and overflow from goathill tavern.
Dude 1: Sounds like complete Randemonium