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1.
A series of rhythmical movements performed in honour of a dull or mundane situation. Often accompanied with a positive vocal in the form of a "yay", "yeah", or "woo-hoo"
Diana and Frank decided to have a little mundance to celebrate that Diana had to leave for work
by Froodles August 19, 2013
 
2.
a small physical celebration in honor of a mundane occurrence
When she found a parking space in front of the restaurant, Carol Sue did a mundance.
by Rufus T Woodrow April 04, 2013