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According to the comedy troupe Monty Python "a dance which was done every 25 minutes in the town of Trondheim in which the old ladies were struck about the head with large clubs". Has come to refer to any gathering where a defenseless group of people are beaten up by soldiers or police for no particular reason.
Q: Hey dude, are you heading down to the G20 protest?

A: Not a chance, dude. That will be a Trondheim Hammer Dance for sure.
by mieh dnort July 20, 2010