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1.
Any condition wherein chaos spreads from its original circumstances to another, usually unrelated, situation.
Everyone went crazy in line when we all found out that the Playstation 4's were shipped late. We all had to call in sick keep our places, so I'm sure it was Tandemonium at work.
by Double Hardhat October 27, 2010
 
2.
having fun together on a tandem

Pandemonium on a tandem
Two people having a good time riding a tandem

Originated from two friends cycling coast to coast on a tandem, one was blind. It was tandemonium!!
by Jimmerdrummer May 08, 2011